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Mesenchyme Stock Photos and Images
The Neural crest formation during neurulation.Vector illustration. Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-neural-crest-formation-during-neurulationvector-illustration-image574672041.htmlRF2TAXG1D–The Neural crest formation during neurulation.Vector illustration.
Simple diagram showing germ layers developed in the stage of gastrula Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/simple-diagram-showing-germ-layers-developed-in-the-stage-of-gastrula-image455027914.htmlRF2HC88MX–Simple diagram showing germ layers developed in the stage of gastrula
Blastula. Starfish Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/blastula-starfish-image188967458.htmlRFMYC5WP–Blastula. Starfish
Blood vessels in embryonic tissue. The vessels are lined by endothelium (simple squamous epithelium) and contain inside immature nucleated red blood c Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/blood-vessels-in-embryonic-tissue-the-vessels-are-lined-by-endothelium-simple-squamous-epithelium-and-contain-inside-immature-nucleated-red-blood-c-image346977257.htmlRF2B4E50W–Blood vessels in embryonic tissue. The vessels are lined by endothelium (simple squamous epithelium) and contain inside immature nucleated red blood c
Anatomys of a bone -- 3D Rendering Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomys-of-a-bone-3d-rendering-image220553506.htmlRFPPR26X–Anatomys of a bone -- 3D Rendering
Osteocyte, a bоне cell that lies within the substance of fully formed bone Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/osteocyte-a-b-cell-that-lies-within-the-substance-of-fully-formed-bone-image432481700.htmlRF2G3H6R0–Osteocyte, a bоне cell that lies within the substance of fully formed bone
Soft fibroma, vintage engraved illustration. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/soft-fibroma-vintage-engraved-illustration-image363153482.htmlRF2C2R1Y6–Soft fibroma, vintage engraved illustration.
Starfish embryo Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/starfish-embryo-image352782926.htmlRM2BDXJ66–Starfish embryo
Blastula Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-blastula-17255121.htmlRFB02129–Blastula
Archive image from page 22 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agaruoft Year: 1920 0 0 Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus ; B, very early prophase ; C, D, middle prophase ; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase {seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in tra Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-22-of-cytology-with-special-reference-to-cytology-with-special-reference-to-the-metazoan-nucleus-cytologywithspec00agaruoft-year-1920-0-0-fig-3-mitosis-in-lepidosiren-mesenchyme-cell-a-resting-nucleus-b-very-early-prophase-c-d-middle-prophase-e-late-prophase-the-nuclear-membrane-has-disappeared-and-the-chromosomes-are-becoming-attached-to-the-spindle-fibres-f-metaphase-seen-from-above-only-about-half-of-the-chromosomes-are-shown-g-anaphase-h-telophase-reconstruction-of-one-of-the-daughter-nuclei-i-two-of-the-chromosomes-from-h-in-tra-image259443809.htmlRMW22K69–Archive image from page 22 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agaruoft Year: 1920 0 0 Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus ; B, very early prophase ; C, D, middle prophase ; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase {seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in tra
. Outlines of zoology. s are arranged in patchesto which branches of the auditory nerve are distributed. With thesesensory patches calcareous concretions (otoliths) are associated, exceptin the cochlea of Mammals. The fact that lime salts are often deposited in the skin, and that theear-sac arises as an insinking of epiblast, may perhaps shed some lighton the origin of otoliths. 494 STRUCTURE OF VERTEBRATA. The parts which we have so far considered constitute together themembranous labyrinth of the ear. Round about them the mesoblast(mesenchyme) forms a two-layered envelope. Its inner layer di Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/outlines-of-zoology-s-are-arranged-in-patchesto-which-branches-of-the-auditory-nerve-are-distributed-with-thesesensory-patches-calcareous-concretions-otoliths-are-associated-exceptin-the-cochlea-of-mammals-the-fact-that-lime-salts-are-often-deposited-in-the-skin-and-that-theear-sac-arises-as-an-insinking-of-epiblast-may-perhaps-shed-some-lighton-the-origin-of-otoliths-494-structure-of-vertebrata-the-parts-which-we-have-so-far-considered-constitute-together-themembranous-labyrinth-of-the-ear-round-about-them-the-mesoblastmesenchyme-forms-a-two-layered-envelope-its-inner-layer-di-image337134936.htmlRM2AGDR1C–. Outlines of zoology. s are arranged in patchesto which branches of the auditory nerve are distributed. With thesesensory patches calcareous concretions (otoliths) are associated, exceptin the cochlea of Mammals. The fact that lime salts are often deposited in the skin, and that theear-sac arises as an insinking of epiblast, may perhaps shed some lighton the origin of otoliths. 494 STRUCTURE OF VERTEBRATA. The parts which we have so far considered constitute together themembranous labyrinth of the ear. Round about them the mesoblast(mesenchyme) forms a two-layered envelope. Its inner layer di
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. K-'-: â :^:^%^. Please Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-from-twelve-to-thirty-six-somites-159-from-the-superior-angles-of-the-neural-tube-into-the-arches-in-question-here-they-form-connections-with-the-ectoderm-of-the-arches-which-proliferates-so-as-to-contribute-to-their-substance-fig-92-elsewhere-the-periaxial-layer-gradually-merges-with-the-axial-mesenchyme-the-periaxial-cords-are-the-primordia-of-the-trigeminus-and-acustico-facialis-ganglia-and-mark-the-paths-of-the-trigeminal-and-facial-nerves-their-connection-with-k-please-image215970106.htmlRMPFA822–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. K-'-: â :^:^%^. Please
![. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. "mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75 Stock Photo](https://c8.alamy.com/comp/MAAT8R/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-fig-20-transverse-sectiim-from-ciubrvd-in-uhicli-i-lii-somites-avc-forming-hut-no-complete-intersoniitic-cleft-has-appeared-columbia-collect-ion-xn-quotmo-slide-3-row-4-section-6-x-300-hcduced-i-loctoderni-4-hyperentodermal-mesenchyme-and-j-mesoderm-incipient-blood-islands-3-entoderm-5-coelom-75-MAAT8R.jpg ". Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. "mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75 Stock Photo")
. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. "mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-fig-20-transverse-sectiim-from-ciubrvd-in-uhicli-i-lii-somites-avc-forming-hut-no-complete-intersoniitic-cleft-has-appeared-columbia-collect-ion-xn-quotmo-slide-3-row-4-section-6-x-300-hcduced-i-loctoderni-4-hyperentodermal-mesenchyme-and-j-mesoderm-incipient-blood-islands-3-entoderm-5-coelom-75-image178488823.htmlRMMAAT8R–. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. "mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75
The Neural crest formation during neurulation.Vector illustration. Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-neural-crest-formation-during-neurulationvector-illustration-image574672056.htmlRF2TAXG20–The Neural crest formation during neurulation.Vector illustration.
Neurulation, development of the structures derived from the ectoderm. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/neurulation-development-of-the-structures-derived-from-the-ectoderm-image455027913.htmlRF2HC88MW–Neurulation, development of the structures derived from the ectoderm.
Blastula Starfish Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-blastula-starfish-17256549.htmlRFB022W9–Blastula Starfish
Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-178-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-from-twelve-to-thirty-six-somites-159-from-the-superior-angles-of-the-neural-tube-into-the-arches-in-question-here-they-form-connections-with-the-ectoderm-of-the-arches-which-proliferates-so-as-to-contribute-to-their-substance-fig-92-elsewhere-the-periaxial-layer-gradually-merges-with-the-axial-mesenchyme-the-periaxial-cords-are-the-primordia-of-the-trigeminus-and-acustico-facialis-ganglia-and-mark-the-paths-of-the-trigeminal-and-image258898881.htmlRMW15T4H–Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Castle also discusses some important theoretical questions. Hepoints out that, in Ciona at least, the chorda-mesenchyme ring takes Eart along with endoderm in the primary invagination, and soelongs to the primary endoderm; while the rest of the mesoderm,the muscle cells of the neuro muscular ring, are carried in by asecondary invagination, and belong to the outer layer of the younggastrula, or primary ectoderm. He considers that the chorda mustbe regarded as a mesodermal organ. He agrees with form Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-encyclopdia-britannica-a-dictionary-of-arts-sciences-literature-and-general-information-castle-also-discusses-some-important-theoretical-questions-hepoints-out-that-in-ciona-at-least-the-chorda-mesenchyme-ring-takes-eart-along-with-endoderm-in-the-primary-invagination-and-soelongs-to-the-primary-endoderm-while-the-rest-of-the-mesodermthe-muscle-cells-of-the-neuro-muscular-ring-are-carried-in-by-asecondary-invagination-and-belong-to-the-outer-layer-of-the-younggastrula-or-primary-ectoderm-he-considers-that-the-chorda-mustbe-regarded-as-a-mesodermal-organ-he-agrees-with-form-image339225034.htmlRM2AKW0YP–The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Castle also discusses some important theoretical questions. Hepoints out that, in Ciona at least, the chorda-mesenchyme ring takes Eart along with endoderm in the primary invagination, and soelongs to the primary endoderm; while the rest of the mesoderm,the muscle cells of the neuro muscular ring, are carried in by asecondary invagination, and belong to the outer layer of the younggastrula, or primary ectoderm. He considers that the chorda mustbe regarded as a mesodermal organ. He agrees with form
. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. THE TJRO-GENITAL SYSTEM iSS. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-anatomy-of-the-domestic-fowl-domestic-animals-veterinary-medicine-poultry-the-tjro-genital-system-iss-layers-of-the-oviduct-which-layers-later-develop-the-muscular-structure-and-the-connective-tissue-the-epithelium-and-its-derivatives-which-represent-the-glandular-structures-are-formed-from-the-walls-of-the-old-miillerian-duct-thus-the-two-sets-of-tissues-having-different-origins-likewise-have-different-functions-the-epithelium-is-concerned-entirely-with-secretion-and-the-deriva-tives-of-the-mesenchyme-are-con-cerned-with-supporting-and-muscu-lar-fimction-to-summarize-image216389145.htmlRMPG1AFN–. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. THE TJRO-GENITAL SYSTEM iSS. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize,
. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . 11 Fig. 11 Transverse section of same enibrvcj at level indicated in preeedinj; tisure, X 30(). Hedueed 7. Sliile fi, row 2, section N. 1 Aorta 2 Oniphaloiiiescrileri Angiocyst of intermediate position 6 Coelom Figs. 12 and 13 Ventral view of nioilel of mesoderm, mesenchyme and vas- cular anlages of an embryo of twelve somites. Columbia Collection Xo.o47. The coelomic mesoderm from the nephrotomes laterad has been omitted, to allow the hypectodermal mesenchyme (gree Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-11-fig-11-transverse-section-of-same-enibrvcj-at-level-indicated-in-preeedinj-tisure-x-30-hedueed-7-sliile-fi-row-2-section-n-1-aorta-2-oniphaloiiiescrileri-angiocyst-of-intermediate-position-6-coelom-figs-12-and-13-ventral-view-of-nioilel-of-mesoderm-mesenchyme-and-vas-cular-anlages-of-an-embryo-of-twelve-somites-columbia-collection-xoo47-the-coelomic-mesoderm-from-the-nephrotomes-laterad-has-been-omitted-to-allow-the-hypectodermal-mesenchyme-gree-image178488833.htmlRMMAAT95–. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . 11 Fig. 11 Transverse section of same enibrvcj at level indicated in preeedinj; tisure, X 30(). Hedueed 7. Sliile fi, row 2, section N. 1 Aorta 2 Oniphaloiiiescrileri Angiocyst of intermediate position 6 Coelom Figs. 12 and 13 Ventral view of nioilel of mesoderm, mesenchyme and vas- cular anlages of an embryo of twelve somites. Columbia Collection Xo.o47. The coelomic mesoderm from the nephrotomes laterad has been omitted, to allow the hypectodermal mesenchyme (gree
Archive image from page 177 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axial mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-177-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-158-the-development-of-the-chick-in-the-neural-suture-it-is-separated-from-the-mesenchyme-in-the-region-of-the-fore-gut-by-a-considerable-space-we-shall-call-the-latter-portion-of-mesenchyme-the-axial-mesenchyme-of-the-head-to-distinguish-it-from-the-mesenchyme-derived-from-the-neural-crest-which-later-lies-lat-eral-to-it-and-which-may-thus-be-known-as-the-periaxial-layer-the-crest-may-be-followed-ante-riorly-to-the-extreme-tip-image258898474.htmlRMW15RJ2–Archive image from page 177 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axial mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip
The development of the human body; a manual of human embryology . des themass into an inner and an outer portion. The cavity isthe anterior chamber of the eye, and it has served to sepa-rate the cornea (co) from the tunica vasculosa lentis (tv),and, extending laterally in all directions, it also separatesfrom the cornea the mesenchyme which rests upon themarginal portion of the optic cup and constitutes thestroma of the iris. Cells arrange themselves on the cor-neal surface of the cavity to form a continuous endotheliallayer, and the mesenchyme which forms the peripheralboundary of the cavity Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-des-themass-into-an-inner-and-an-outer-portion-the-cavity-isthe-anterior-chamber-of-the-eye-and-it-has-served-to-sepa-rate-the-cornea-co-from-the-tunica-vasculosa-lentis-tvand-extending-laterally-in-all-directions-it-also-separatesfrom-the-cornea-the-mesenchyme-which-rests-upon-themarginal-portion-of-the-optic-cup-and-constitutes-thestroma-of-the-iris-cells-arrange-themselves-on-the-cor-neal-surface-of-the-cavity-to-form-a-continuous-endotheliallayer-and-the-mesenchyme-which-forms-the-peripheralboundary-of-the-cavity-image340297500.htmlRM2ANHTX4–The development of the human body; a manual of human embryology . des themass into an inner and an outer portion. The cavity isthe anterior chamber of the eye, and it has served to sepa-rate the cornea (co) from the tunica vasculosa lentis (tv),and, extending laterally in all directions, it also separatesfrom the cornea the mesenchyme which rests upon themarginal portion of the optic cup and constitutes thestroma of the iris. Cells arrange themselves on the cor-neal surface of the cavity to form a continuous endotheliallayer, and the mesenchyme which forms the peripheralboundary of the cavity
. The development of the chick; an introduction to embryology. Birds -- Embryology. 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axial mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip of the neural tube, and posteriorly to the region of the anterior intesti- Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-158-the-development-of-the-chick-in-the-neural-suture-it-is-separated-from-the-mesenchyme-in-the-region-of-the-fore-gut-by-a-considerable-space-we-shall-call-the-latter-portion-of-mesenchyme-the-axial-mesenchyme-of-the-head-to-distinguish-it-from-the-mesenchyme-derived-from-the-neural-crest-which-later-lies-lat-eral-to-it-and-which-may-thus-be-known-as-the-periaxial-layer-the-crest-may-be-followed-ante-riorly-to-the-extreme-tip-of-the-neural-tube-and-posteriorly-to-the-region-of-the-anterior-intesti-image215970284.htmlRMPFA88C–. The development of the chick; an introduction to embryology. Birds -- Embryology. 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axial mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip of the neural tube, and posteriorly to the region of the anterior intesti-
. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . FiS- •') Transverse sootion of lui embryo of two somites ;it the level iiuli- eated in Figure 3. Slide .5, row 1, section 0, X 300. Reduced J-. 1 Ectoderm 2 Mesoderm 3 Entoderm 4 Hypectodennal mesenchyme 5 Hypercntodermal mesenchyme 6 Coelom 7 Xeural plate Fig. (J Dorsal view of model of mesoderm ^white), mesenchyme (green) and vasofactive cells (yellow) of an embryo of four somites. Columbia collection No. 409, X 300. Reduced !,. 1 Somite 1 2 Anlages of .juxta-ncur Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-fis-transverse-sootion-of-lui-embryo-of-two-somites-it-the-level-iiuli-eated-in-figure-3-slide-5-row-1-section-0-x-300-reduced-j-1-ectoderm-2-mesoderm-3-entoderm-4-hypectodennal-mesenchyme-5-hypercntodermal-mesenchyme-6-coelom-7-xeural-plate-fig-j-dorsal-view-of-model-of-mesoderm-white-mesenchyme-green-and-vasofactive-cells-yellow-of-an-embryo-of-four-somites-columbia-collection-no-409-x-300-reduced-!-1-somite-1-2-anlages-of-juxta-ncur-image178488842.htmlRMMAAT9E–. Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium . FiS- •') Transverse sootion of lui embryo of two somites ;it the level iiuli- eated in Figure 3. Slide .5, row 1, section 0, X 300. Reduced J-. 1 Ectoderm 2 Mesoderm 3 Entoderm 4 Hypectodennal mesenchyme 5 Hypercntodermal mesenchyme 6 Coelom 7 Xeural plate Fig. (J Dorsal view of model of mesoderm ^white), mesenchyme (green) and vasofactive cells (yellow) of an embryo of four somites. Columbia collection No. 409, X 300. Reduced !,. 1 Somite 1 2 Anlages of .juxta-ncur
Archive image from page 475 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 464 THE ANTERIOR CHAMBER OF THE EYE more numerous laterally than at the center, are embedded. Still later cells from the adjacent mesenchyme grow into the layer, which increases considerably in thickness, and blood-vessels also grow into that portion of it which is in contact with the outer surface of the lens. At this stage the interval between the surface ectoderm and the lens is occupied by a solid mass of mesodermal tissue (Fig. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-475-of-the-development-of-the-human-the-development-of-the-human-body-a-manual-of-human-embryology-developmentofhum00mcmu-year-1914-464-the-anterior-chamber-of-the-eye-more-numerous-laterally-than-at-the-center-are-embedded-still-later-cells-from-the-adjacent-mesenchyme-grow-into-the-layer-which-increases-considerably-in-thickness-and-blood-vessels-also-grow-into-that-portion-of-it-which-is-in-contact-with-the-outer-surface-of-the-lens-at-this-stage-the-interval-between-the-surface-ectoderm-and-the-lens-is-occupied-by-a-solid-mass-of-mesodermal-tissue-fig-image259032885.htmlRMW1BY2D–Archive image from page 475 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 464 THE ANTERIOR CHAMBER OF THE EYE more numerous laterally than at the center, are embedded. Still later cells from the adjacent mesenchyme grow into the layer, which increases considerably in thickness, and blood-vessels also grow into that portion of it which is in contact with the outer surface of the lens. At this stage the interval between the surface ectoderm and the lens is occupied by a solid mass of mesodermal tissue (Fig.
The development of the human body; a manual of human embryology . number of suchunits. The greater part of the origi-nal pulmonary groove becomesconverted into the trachea, andin the mesenchyme surroundingit the incomplete cartilaginousrings develop at about- theeighth or ninth week. The cellsof the epithelial lining of thetrachea and bronchi remain col-umnar or cubical in form andbecome ciliated at about thefourth month, but those of theepithelium of the air-sacs be-come greatly flattened and con-stitute an exceedingly thin layerof pavement epithelium. The Development of the Larynx.—The openi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-number-of-suchunits-the-greater-part-of-the-origi-nal-pulmonary-groove-becomesconverted-into-the-trachea-andin-the-mesenchyme-surroundingit-the-incomplete-cartilaginousrings-develop-at-about-theeighth-or-ninth-week-the-cellsof-the-epithelial-lining-of-thetrachea-and-bronchi-remain-col-umnar-or-cubical-in-form-andbecome-ciliated-at-about-thefourth-month-but-those-of-theepithelium-of-the-air-sacs-be-come-greatly-flattened-and-con-stitute-an-exceedingly-thin-layerof-pavement-epithelium-the-development-of-the-larynxthe-openi-image342655588.htmlRM2AWD8KG–The development of the human body; a manual of human embryology . number of suchunits. The greater part of the origi-nal pulmonary groove becomesconverted into the trachea, andin the mesenchyme surroundingit the incomplete cartilaginousrings develop at about- theeighth or ninth week. The cellsof the epithelial lining of thetrachea and bronchi remain col-umnar or cubical in form andbecome ciliated at about thefourth month, but those of theepithelium of the air-sacs be-come greatly flattened and con-stitute an exceedingly thin layerof pavement epithelium. The Development of the Larynx.—The openi
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 436 THE DEVELOPMENT OF THE CHICK procoracoid component does not develop beyond the membranous stage in the chick. It is interesting that the clavicle is the first center of ossi- fication in the body, though perichondral ossification of some of the long bones begins almost as soon. The Wing-hones. The primordium of the wing-bones is found in the axial mesenchyme of the wing-bud, which is origi- nally continuous with the primordium of the pectoral girdle, and shows no trace of the future elements of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-436-the-development-of-the-chick-procoracoid-component-does-not-develop-beyond-the-membranous-stage-in-the-chick-it-is-interesting-that-the-clavicle-is-the-first-center-of-ossi-fication-in-the-body-though-perichondral-ossification-of-some-of-the-long-bones-begins-almost-as-soon-the-wing-hones-the-primordium-of-the-wing-bones-is-found-in-the-axial-mesenchyme-of-the-wing-bud-which-is-origi-nally-continuous-with-the-primordium-of-the-pectoral-girdle-and-shows-no-trace-of-the-future-elements-of-image215957730.htmlRMPF9M82–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 436 THE DEVELOPMENT OF THE CHICK procoracoid component does not develop beyond the membranous stage in the chick. It is interesting that the clavicle is the first center of ossi- fication in the body, though perichondral ossification of some of the long bones begins almost as soon. The Wing-hones. The primordium of the wing-bones is found in the axial mesenchyme of the wing-bud, which is origi- nally continuous with the primordium of the pectoral girdle, and shows no trace of the future elements of
Archive image from page 194 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there ar Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-194-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-from-twelve-to-thirty-six-somites-175-visceral-furrows-in-front-of-the-first-at-the-14-16-s-stage-these-he-in-terprets-as-phyletic-rudiments-it-is-certain-that-the-lower-vertebrates-had-pouches-posterior-to-the-fourth-the-post-branchial-bodies-see-p-309-are-probably-rudiments-of-a-fifth-pair-of-pouches-the-tissue-between-the-visceral-pouches-thickens-by-accumu-lation-of-mesenchyme-to-form-the-visceral-arches-of-which-there-ar-image258901891.htmlRMW16003–Archive image from page 194 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there ar
Papers . e grown toward the median ventral line,although there has as yet been no contact or union between the endsof the rods of opposite sides. Comparison with other Investigations of Cidaris. Cidaris tribuloides, as may be seen from the foregoing description,is quite unlike the more familiar echinoids in the time and place of 10 Hybndization of Echinoids. formation of primary mesenchyme and in the form of the pluteus.The only detailed description I have found of the early developmentof a Cidarid is that of Prouho (1887) on Dorocidaris papillata. Therate of development of this form is very s Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/papers-e-grown-toward-the-median-ventral-linealthough-there-has-as-yet-been-no-contact-or-union-between-the-endsof-the-rods-of-opposite-sides-comparison-with-other-investigations-of-cidaris-cidaris-tribuloides-as-may-be-seen-from-the-foregoing-descriptionis-quite-unlike-the-more-familiar-echinoids-in-the-time-and-place-of-10-hybndization-of-echinoids-formation-of-primary-mesenchyme-and-in-the-form-of-the-pluteusthe-only-detailed-description-i-have-found-of-the-early-developmentof-a-cidarid-is-that-of-prouho-1887-on-dorocidaris-papillata-therate-of-development-of-this-form-is-very-s-image342820149.htmlRM2AWMPGN–Papers . e grown toward the median ventral line,although there has as yet been no contact or union between the endsof the rods of opposite sides. Comparison with other Investigations of Cidaris. Cidaris tribuloides, as may be seen from the foregoing description,is quite unlike the more familiar echinoids in the time and place of 10 Hybndization of Echinoids. formation of primary mesenchyme and in the form of the pluteus.The only detailed description I have found of the early developmentof a Cidarid is that of Prouho (1887) on Dorocidaris papillata. Therate of development of this form is very s
. The development of the chick; an introduction to embryology. Birds -- Embryology. 264 THE DEVELOPMENT OF THE CHICK from the central ends of the neuroblasts and grow into the mesenchyme towards the fore-brain. At the same time groups of epithelial cells free themselves from the inner face of the olfactory epithelium, and come to lie between this and the fore- brain. The axones of the neuroblasts grow between these cells until they reach the base of the fore-brain over which they spread out, entering the olfactory lobe about the sixth day (Figs. 155 and 156). In the meantime the peripheral end Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-264-the-development-of-the-chick-from-the-central-ends-of-the-neuroblasts-and-grow-into-the-mesenchyme-towards-the-fore-brain-at-the-same-time-groups-of-epithelial-cells-free-themselves-from-the-inner-face-of-the-olfactory-epithelium-and-come-to-lie-between-this-and-the-fore-brain-the-axones-of-the-neuroblasts-grow-between-these-cells-until-they-reach-the-base-of-the-fore-brain-over-which-they-spread-out-entering-the-olfactory-lobe-about-the-sixth-day-figs-155-and-156-in-the-meantime-the-peripheral-end-image215969851.htmlRMPFA7MY–. The development of the chick; an introduction to embryology. Birds -- Embryology. 264 THE DEVELOPMENT OF THE CHICK from the central ends of the neuroblasts and grow into the mesenchyme towards the fore-brain. At the same time groups of epithelial cells free themselves from the inner face of the olfactory epithelium, and come to lie between this and the fore- brain. The axones of the neuroblasts grow between these cells until they reach the base of the fore-brain over which they spread out, entering the olfactory lobe about the sixth day (Figs. 155 and 156). In the meantime the peripheral end
![Archive image from page 164 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be Stock Photo](https://c8.alamy.com/comp/W15M84/archive-image-from-page-164-of-the-development-of-the-frogs-the-development-of-the-frogs-egg-an-introduction-to-experimental-embryology-developmentoffro00morg-year-1897-ch-xiv-organs-from-the-mesoderm-149-outer-side-of-each-somite-by-tlie-entire-somatic-layer-along-the-ventral-and-median-boundaries-of-the-somites-a-layer-having-a-loose-epithelial-character-mesenchyme-is-also-to-be-seen-thus-the-central-mass-whicli-is-to-develop-into-the-myotome-lies-on-the-median-side-of-the-coelom-and-is-wholly-surrounded-by-an-epithelial-layer-frontal-sections-show-that-this-layer-can-also-be-W15M84.jpg "Archive image from page 164 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be Stock Photo")
Archive image from page 164 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-164-of-the-development-of-the-frogs-the-development-of-the-frogs-egg-an-introduction-to-experimental-embryology-developmentoffro00morg-year-1897-ch-xiv-organs-from-the-mesoderm-149-outer-side-of-each-somite-by-tlie-entire-somatic-layer-along-the-ventral-and-median-boundaries-of-the-somites-a-layer-having-a-loose-epithelial-character-mesenchyme-is-also-to-be-seen-thus-the-central-mass-whicli-is-to-develop-into-the-myotome-lies-on-the-median-side-of-the-coelom-and-is-wholly-surrounded-by-an-epithelial-layer-frontal-sections-show-that-this-layer-can-also-be-image258895844.htmlRMW15M84–Archive image from page 164 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be
The development of the human body; a manual of human embryology . n the median line by a deep groove, the floor ofwhich is the somewhat thickened floor-plate. About thefourth month there appears in the roof-plate a transversegroove into which the surrounding mesenchyme dips, and,as the groove deepens in later stages, the mesenchyme con-tinued within it becomes converted into blood-vessels,forming the chorioid plexus of the fourth ventricle, astructure which, as may be seen from its development,does not lie within the cavity of the ventricle, but is 4o8 THE DEVELOPMENT OF THE HUMAN BODY. separa Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-n-the-median-line-by-a-deep-groove-the-floor-ofwhich-is-the-somewhat-thickened-floor-plate-about-thefourth-month-there-appears-in-the-roof-plate-a-transversegroove-into-which-the-surrounding-mesenchyme-dips-andas-the-groove-deepens-in-later-stages-the-mesenchyme-con-tinued-within-it-becomes-converted-into-blood-vesselsforming-the-chorioid-plexus-of-the-fourth-ventricle-astructure-which-as-may-be-seen-from-its-developmentdoes-not-lie-within-the-cavity-of-the-ventricle-but-is-4o8-the-development-of-the-human-body-separa-image342645533.htmlRM2AWCRTD–The development of the human body; a manual of human embryology . n the median line by a deep groove, the floor ofwhich is the somewhat thickened floor-plate. About thefourth month there appears in the roof-plate a transversegroove into which the surrounding mesenchyme dips, and,as the groove deepens in later stages, the mesenchyme con-tinued within it becomes converted into blood-vessels,forming the chorioid plexus of the fourth ventricle, astructure which, as may be seen from its development,does not lie within the cavity of the ventricle, but is 4o8 THE DEVELOPMENT OF THE HUMAN BODY. separa
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE SKELETON 417 a separate component. SchauinsUincl has interpreted it as the homologue of the haemal arches of reptilia {e.g., Sphenodon), The membrane represents not only the future bony parts but the ligaments and periosteum as well. Hence we find that the successive membranous vertebrae are not separate structures but are united by membrane, i.e., condensed mesenchyme, and are distinguishable from the future ligaments at first only by greater condensation. In the stage of Fig. 233, chondrifica Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-the-skeleton-417-a-separate-component-schauinsuincl-has-interpreted-it-as-the-homologue-of-the-haemal-arches-of-reptilia-eg-sphenodon-the-membrane-represents-not-only-the-future-bony-parts-but-the-ligaments-and-periosteum-as-well-hence-we-find-that-the-successive-membranous-vertebrae-are-not-separate-structures-but-are-united-by-membrane-ie-condensed-mesenchyme-and-are-distinguishable-from-the-future-ligaments-at-first-only-by-greater-condensation-in-the-stage-of-fig-233-chondrifica-image215957761.htmlRMPF9M95–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE SKELETON 417 a separate component. SchauinsUincl has interpreted it as the homologue of the haemal arches of reptilia {e.g., Sphenodon), The membrane represents not only the future bony parts but the ligaments and periosteum as well. Hence we find that the successive membranous vertebrae are not separate structures but are united by membrane, i.e., condensed mesenchyme, and are distinguishable from the future ligaments at first only by greater condensation. In the stage of Fig. 233, chondrifica
Archive image from page 176 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of c Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-176-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-c-image258898384.htmlRMW15RET–Archive image from page 176 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of c
. The American journal of anatomy. ion of the optic vesicle into the region between the otic capsuleand medulla. Section through transplanted eye, otic capsule, and medulla.The eye, owing to irregular invagination, has only a very narrow pupil andsmall, irregular cup cavity. Most of the optic nerve-fibers pass from theirregular ganglionic layer through the narrow pupil into the mesenchymeventral to the otic capsule, where it splits into two divisions, the ventralone of these runs a short distance and ends abruptly in the mesenchyme,the other runs to the cartilage ventral to the otic vesicle an Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-ion-of-the-optic-vesicle-into-the-region-between-the-otic-capsuleand-medulla-section-through-transplanted-eye-otic-capsule-and-medullathe-eye-owing-to-irregular-invagination-has-only-a-very-narrow-pupil-andsmall-irregular-cup-cavity-most-of-the-optic-nerve-fibers-pass-from-theirregular-ganglionic-layer-through-the-narrow-pupil-into-the-mesenchymeventral-to-the-otic-capsule-where-it-splits-into-two-divisions-the-ventralone-of-these-runs-a-short-distance-and-ends-abruptly-in-the-mesenchymethe-other-runs-to-the-cartilage-ventral-to-the-otic-vesicle-an-image337091066.htmlRM2AGBR2J–. The American journal of anatomy. ion of the optic vesicle into the region between the otic capsuleand medulla. Section through transplanted eye, otic capsule, and medulla.The eye, owing to irregular invagination, has only a very narrow pupil andsmall, irregular cup cavity. Most of the optic nerve-fibers pass from theirregular ganglionic layer through the narrow pupil into the mesenchymeventral to the otic capsule, where it splits into two divisions, the ventralone of these runs a short distance and ends abruptly in the mesenchyme,the other runs to the cartilage ventral to the otic vesicle an
![. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. #5 i^i^'t.f/*"*'-. Please note Stock Photo](https://c8.alamy.com/comp/PFA888/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-159-from-the-superior-angles-of-the-neural-tube-into-the-arches-in-question-here-they-form-connections-with-the-ectoderm-of-the-arches-which-proliferates-so-as-to-contribute-to-their-substance-fig-92-elsewhere-the-periaxial-layer-gradually-merges-with-the-axial-mesenchyme-the-periaxial-cords-are-the-primordia-of-the-trigeminus-and-acustico-facialis-ganglia-and-mark-the-paths-of-the-trigeminal-and-facial-nerves-their-connection-with-5-iitfquot-please-note-PFA888.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. #5 i^i^'t.f/*"*'-. Please note Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. #5 i^i^'t.f/*"*'-. Please note Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-159-from-the-superior-angles-of-the-neural-tube-into-the-arches-in-question-here-they-form-connections-with-the-ectoderm-of-the-arches-which-proliferates-so-as-to-contribute-to-their-substance-fig-92-elsewhere-the-periaxial-layer-gradually-merges-with-the-axial-mesenchyme-the-periaxial-cords-are-the-primordia-of-the-trigeminus-and-acustico-facialis-ganglia-and-mark-the-paths-of-the-trigeminal-and-facial-nerves-their-connection-with-5-iitfquot-please-note-image215970280.htmlRMPFA888–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 159 from the superior angles of the neural tube into the arches in question; here they form connections with the ectoderm of the arches, which proliferates so as to contribute to their substance (Fig. 92). Elsewhere the periaxial layer gradually merges with the axial mesenchyme. The periaxial cords are the primordia of the trigeminus and acustico-facialis ganglia, and mark the paths of the trigeminal and facial nerves. Their connection with. #5 i^i^'t.f/*"*'-. Please note
Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 #5 ii't.f/''- Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchym Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-178-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-5-iitf-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchym-image258898880.htmlRMW15T4G–Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 #5 ii't.f/''- Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchym
The porifera and coelentera . cells which are the mother cells of the skeleto-trophicgroup of tissues, and are destined to form connective tissue, blood-vessels, and blood. The relation of the mesenchyme cells (asshown in such cases as those represented in Figs. 9 and 10) tothe blastocoel or primary cavity of the blastula seems to favourthe notion that the blood-vascular system has originated from theblastoccel in co-oj)eration, so to speak, with mesenchyme cells.Whether, as is most probable, the mesenchyme also gives rise tomuscle cells and muscular tissue is a matter requiring close inves-ti Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-porifera-and-coelentera-cells-which-are-the-mother-cells-of-the-skeleto-trophicgroup-of-tissues-and-are-destined-to-form-connective-tissue-blood-vessels-and-blood-the-relation-of-the-mesenchyme-cells-asshown-in-such-cases-as-those-represented-in-figs-9-and-10-tothe-blastocoel-or-primary-cavity-of-the-blastula-seems-to-favourthe-notion-that-the-blood-vascular-system-has-originated-from-theblastoccel-in-co-ojeration-so-to-speak-with-mesenchyme-cellswhether-as-is-most-probable-the-mesenchyme-also-gives-rise-tomuscle-cells-and-muscular-tissue-is-a-matter-requiring-close-inves-ti-image343381324.htmlRM2AXJAAM–The porifera and coelentera . cells which are the mother cells of the skeleto-trophicgroup of tissues, and are destined to form connective tissue, blood-vessels, and blood. The relation of the mesenchyme cells (asshown in such cases as those represented in Figs. 9 and 10) tothe blastocoel or primary cavity of the blastula seems to favourthe notion that the blood-vascular system has originated from theblastoccel in co-oj)eration, so to speak, with mesenchyme cells.Whether, as is most probable, the mesenchyme also gives rise tomuscle cells and muscular tissue is a matter requiring close inves-ti
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axigl mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip of the neural tube, and posteriorly to the region of the ante Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-158-the-development-of-the-chick-in-the-neural-suture-it-is-separated-from-the-mesenchyme-in-the-region-of-the-fore-gut-by-a-considerable-space-we-shall-call-the-latter-portion-of-mesenchyme-the-axigl-mesenchyme-of-the-head-to-distinguish-it-from-the-mesenchyme-derived-from-the-neural-crest-which-later-lies-lat-eral-to-it-and-which-may-thus-be-known-as-the-periaxial-layer-the-crest-may-be-followed-ante-riorly-to-the-extreme-tip-of-the-neural-tube-and-posteriorly-to-the-region-of-the-ante-image215970109.htmlRMPFA825–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 158 THE DEVELOPMENT OF THE CHICK in the neural suture; it is separated from the mesenchyme in the region of the fore-gut by a considerable space. (We shall call the latter portion of mesenchyme the axigl mesenchyme of the head, to distinguish it from the mesenchyme derived from the neural crest, which later lies lat- eral to it, and which may thus be known as the periaxial layer.) The crest may be followed ante- riorly to the extreme tip of the neural tube, and posteriorly to the region of the ante
Archive image from page 448 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 <&WB , l&iSpfc Fig. 259.—Section of the Cochlear Duct of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of cochlear duct; M.t, membrana tectoria; V.s.p, vein; 1 to 7, spiral organ of Corti.—(Baginsky.) giving rise to a rather complicated structure whose development has been traced in the rabbit. Along the whole length of the cochlear duct the cells resting upon that half of the basilar membrane which is nearest the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-448-of-the-development-of-the-human-the-development-of-the-human-body-a-manual-of-human-embryology-developmentofhum00mcmu-year-1914-ltwb-lispfc-fig-259section-of-the-cochlear-duct-of-a-rabbit-embryo-of-55-mm-a-mesenchyme-b-to-e-epithelium-of-cochlear-duct-mt-membrana-tectoria-vsp-vein-1-to-7-spiral-organ-of-cortibaginsky-giving-rise-to-a-rather-complicated-structure-whose-development-has-been-traced-in-the-rabbit-along-the-whole-length-of-the-cochlear-duct-the-cells-resting-upon-that-half-of-the-basilar-membrane-which-is-nearest-the-image259029875.htmlRMW1BR6Y–Archive image from page 448 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 <&WB , l&iSpfc Fig. 259.—Section of the Cochlear Duct of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of cochlear duct; M.t, membrana tectoria; V.s.p, vein; 1 to 7, spiral organ of Corti.—(Baginsky.) giving rise to a rather complicated structure whose development has been traced in the rabbit. Along the whole length of the cochlear duct the cells resting upon that half of the basilar membrane which is nearest the
The development of the human body; a manual of human embryology . ning the origin ofthe mesenchyme from which the mammalian skull is de-veloped, yet, since there is probably a continuation for-ward into the cranial region of the series of mesodermicsomites, it is suppos-able that these furnishthe mesenchyme forthe skull, just as themore posterior somitesfurnish that for thevertebra?. In the earliest stagesthe human skull is rep-resented by a continu-ous mass of mesen-chyme which investsthe anterior portion ofthe notochord and ex-tends forward beyondits extremity into thenasal region, forming a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-ning-the-origin-ofthe-mesenchyme-from-which-the-mammalian-skull-is-de-veloped-yet-since-there-is-probably-a-continuation-for-ward-into-the-cranial-region-of-the-series-of-mesodermicsomites-it-is-suppos-able-that-these-furnishthe-mesenchyme-forthe-skull-just-as-themore-posterior-somitesfurnish-that-for-thevertebra-in-the-earliest-stagesthe-human-skull-is-rep-resented-by-a-continu-ous-mass-of-mesen-chyme-which-investsthe-anterior-portion-ofthe-notochord-and-ex-tends-forward-beyondits-extremity-into-thenasal-region-forming-a-image342698837.htmlRM2AWF7T5–The development of the human body; a manual of human embryology . ning the origin ofthe mesenchyme from which the mammalian skull is de-veloped, yet, since there is probably a continuation for-ward into the cranial region of the series of mesodermicsomites, it is suppos-able that these furnishthe mesenchyme forthe skull, just as themore posterior somitesfurnish that for thevertebra?. In the earliest stagesthe human skull is rep-resented by a continu-ous mass of mesen-chyme which investsthe anterior portion ofthe notochord and ex-tends forward beyondits extremity into thenasal region, forming a
. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize, six layers of tissue occur i Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-anatomy-of-the-domestic-fowl-domestic-animals-veterinary-medicine-poultry-layers-of-the-oviduct-which-layers-later-develop-the-muscular-structure-and-the-connective-tissue-the-epithelium-and-its-derivatives-which-represent-the-glandular-structures-are-formed-from-the-walls-of-the-old-miillerian-duct-thus-the-two-sets-of-tissues-having-different-origins-likewise-have-different-functions-the-epithelium-is-concerned-entirely-with-secretion-and-the-deriva-tives-of-the-mesenchyme-are-con-cerned-with-supporting-and-muscu-lar-fimction-to-summarize-six-layers-of-tissue-occur-i-image216389141.htmlRMPG1AFH–. The anatomy of the domestic fowl . Domestic animals; Veterinary medicine; Poultry. layers of the oviduct, which layers later develop the muscular structure and the connective tissue. The epithelium and its derivatives, which represent the glandular structures, are formed from the walls of the old Miillerian duct. Thus the two sets of tissues, having different origins, likewise have different functions. The epithelium is concerned entirely with secretion, and the deriva- tives of the mesenchyme are con- cerned with supporting and muscu- lar fimction. To summarize, six layers of tissue occur i
Embryology (1949) Embryology embryology00bart Year: 1949 MESENCEPHALON DORSAL AORTA MESENCHYME VENTRAL AORTA Fig. 131. A section through the mesencephalon of a 33-hour chick embryo. The foregut is a V-shaped cavity, and its ventral border is in contact with the head epidermis. Above the foregut are the dorsal aortae and below, the ventral aortae. The future aortic arches will connect these vessels. DORSAL AORTA DORSAL MESOCARDIUM EPIMYOCARDIUM Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-1949-embryology-embryology00bart-year-1949-mesencephalon-dorsal-aorta-mesenchyme-ventral-aorta-fig-131-a-section-through-the-mesencephalon-of-a-33-hour-chick-embryo-the-foregut-is-a-v-shaped-cavity-and-its-ventral-border-is-in-contact-with-the-head-epidermis-above-the-foregut-are-the-dorsal-aortae-and-below-the-ventral-aortae-the-future-aortic-arches-will-connect-these-vessels-dorsal-aorta-dorsal-mesocardium-epimyocardium-image239619511.htmlRMRWRH3K–Embryology (1949) Embryology embryology00bart Year: 1949 MESENCEPHALON DORSAL AORTA MESENCHYME VENTRAL AORTA Fig. 131. A section through the mesencephalon of a 33-hour chick embryo. The foregut is a V-shaped cavity, and its ventral border is in contact with the head epidermis. Above the foregut are the dorsal aortae and below, the ventral aortae. The future aortic arches will connect these vessels. DORSAL AORTA DORSAL MESOCARDIUM EPIMYOCARDIUM
Papers . ieth hour and pushes backuntil it comes into contact with the future esophagus, the iimer endof the archenteron having been directed toward the veritral side. Hyhridizfition of Echinoids. 9 In some sections of embryos of an age of 73 hours the mouth openingdoes not seem to be established; in others the opening is present.It is therefore safe to say that the mouth opens about the beginningof the fourth day. The first appearance of skeletal spicules is aboutthis time, these spicules arising in groups of mesenchyme cells atabout the level of the outer ends of the posterior ciliated bands Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/papers-ieth-hour-and-pushes-backuntil-it-comes-into-contact-with-the-future-esophagus-the-iimer-endof-the-archenteron-having-been-directed-toward-the-veritral-side-hyhridizfition-of-echinoids-9-in-some-sections-of-embryos-of-an-age-of-73-hours-the-mouth-openingdoes-not-seem-to-be-established-in-others-the-opening-is-presentit-is-therefore-safe-to-say-that-the-mouth-opens-about-the-beginningof-the-fourth-day-the-first-appearance-of-skeletal-spicules-is-aboutthis-time-these-spicules-arising-in-groups-of-mesenchyme-cells-atabout-the-level-of-the-outer-ends-of-the-posterior-ciliated-bands-image342821613.htmlRM2AWMTD1–Papers . ieth hour and pushes backuntil it comes into contact with the future esophagus, the iimer endof the archenteron having been directed toward the veritral side. Hyhridizfition of Echinoids. 9 In some sections of embryos of an age of 73 hours the mouth openingdoes not seem to be established; in others the opening is present.It is therefore safe to say that the mouth opens about the beginningof the fourth day. The first appearance of skeletal spicules is aboutthis time, these spicules arising in groups of mesenchyme cells atabout the level of the outer ends of the posterior ciliated bands
. The development of the chick; an introduction to embryology. Birds -- Embryology. 436 THE DEVELOPMENT OF THE CHICK procoracoid component does not develop beyond the membranous stage in the chick. It is interesting that the clavicle is the first center of ossi- fication in the body, though perichondral ossification of some of the long bones begins almost as soon. The Wing-hones. The primordium of the wing-bones is found in the axial mesenchyme of the wing-bud, which is origi- nally continuous with the primordium of the pectoral girdle, and shows no trace of the future elements of the skeleton Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-436-the-development-of-the-chick-procoracoid-component-does-not-develop-beyond-the-membranous-stage-in-the-chick-it-is-interesting-that-the-clavicle-is-the-first-center-of-ossi-fication-in-the-body-though-perichondral-ossification-of-some-of-the-long-bones-begins-almost-as-soon-the-wing-hones-the-primordium-of-the-wing-bones-is-found-in-the-axial-mesenchyme-of-the-wing-bud-which-is-origi-nally-continuous-with-the-primordium-of-the-pectoral-girdle-and-shows-no-trace-of-the-future-elements-of-the-skeleton-image215957786.htmlRMPF9MA2–. The development of the chick; an introduction to embryology. Birds -- Embryology. 436 THE DEVELOPMENT OF THE CHICK procoracoid component does not develop beyond the membranous stage in the chick. It is interesting that the clavicle is the first center of ossi- fication in the body, though perichondral ossification of some of the long bones begins almost as soon. The Wing-hones. The primordium of the wing-bones is found in the axial mesenchyme of the wing-bud, which is origi- nally continuous with the primordium of the pectoral girdle, and shows no trace of the future elements of the skeleton
Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. 'mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-earlystagesofvas03schuuoft-year-1914-fig-20-transverse-sectiim-from-ciubrvd-in-uhicli-i-lii-somites-avc-forming-hut-no-complete-intersoniitic-cleft-has-appeared-columbia-collect-ion-xn-mo-slide-3-row-4-section-6-x-300-hcduced-i-loctoderni-4-hyperentodermal-mesenchyme-and-j-mesoderm-incipient-blood-islands-3-entoderm-5-coelom-75-image240705776.htmlRMRYH2JT–Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 Fig. 20 Transverse sectiim from ciubrvd in uhicli I lii' somites -avc forming. hut no complete intersoniitic cleft has appeared. Columbia Collect ion Xn. 'mO. slide 3, row 4, section 6, X 300. Hcduced ',. I lOctoderni 4 Hyperentodermal mesenchyme and •J Mesoderm incipient blood islands 3 Entoderm 5 Coelom 75
. Outlines of zoology. wall. From this body wallthe test can be readily removed, the two being unattachedexcept at one spot, where blood vessels pass into the test,and also to a less degree at the two openings. To beginwith, this test is a true cuticle, produced by secretoryprolongations of the ectoderm cells; but soon after itsformation mesenchyme cells migrate into it, and give riseto patches of connective tissue cells. These cells apparentlyretain throughout life some phagocytic importance. InAscidia outgrowths of the body wall with prolongations ofblood channels enter the test, ramifying i Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/outlines-of-zoology-wall-from-this-body-wallthe-test-can-be-readily-removed-the-two-being-unattachedexcept-at-one-spot-where-blood-vessels-pass-into-the-testand-also-to-a-less-degree-at-the-two-openings-to-beginwith-this-test-is-a-true-cuticle-produced-by-secretoryprolongations-of-the-ectoderm-cells-but-soon-after-itsformation-mesenchyme-cells-migrate-into-it-and-give-riseto-patches-of-connective-tissue-cells-these-cells-apparentlyretain-throughout-life-some-phagocytic-importance-inascidia-outgrowths-of-the-body-wall-with-prolongations-ofblood-channels-enter-the-test-ramifying-i-image337140899.htmlRM2AGE2JB–. Outlines of zoology. wall. From this body wallthe test can be readily removed, the two being unattachedexcept at one spot, where blood vessels pass into the test,and also to a less degree at the two openings. To beginwith, this test is a true cuticle, produced by secretoryprolongations of the ectoderm cells; but soon after itsformation mesenchyme cells migrate into it, and give riseto patches of connective tissue cells. These cells apparentlyretain throughout life some phagocytic importance. InAscidia outgrowths of the body wall with prolongations ofblood channels enter the test, ramifying i
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 264 THE DEVELOPMENT OF THE CHICK from the central ends of the neiirol^hxsts and grow into the mesenchyme towards the fore-brain. At the same time groups of epitheUal cells free themselves from the inner face of the olfactory epithelium, and come to lie between this and the fore- brain. The axones of the neuroblasts grow between these cells until they reach the base of the fore-brain over which they spread out, entering the olfactory lobe about the sixth day (Figs. 155 and 156). In the meantime the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-264-the-development-of-the-chick-from-the-central-ends-of-the-neiirolhxsts-and-grow-into-the-mesenchyme-towards-the-fore-brain-at-the-same-time-groups-of-epitheual-cells-free-themselves-from-the-inner-face-of-the-olfactory-epithelium-and-come-to-lie-between-this-and-the-fore-brain-the-axones-of-the-neuroblasts-grow-between-these-cells-until-they-reach-the-base-of-the-fore-brain-over-which-they-spread-out-entering-the-olfactory-lobe-about-the-sixth-day-figs-155-and-156-in-the-meantime-the-image215969749.htmlRMPFA7H9–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 264 THE DEVELOPMENT OF THE CHICK from the central ends of the neiirol^hxsts and grow into the mesenchyme towards the fore-brain. At the same time groups of epitheUal cells free themselves from the inner face of the olfactory epithelium, and come to lie between this and the fore- brain. The axones of the neuroblasts grow between these cells until they reach the base of the fore-brain over which they spread out, entering the olfactory lobe about the sixth day (Figs. 155 and 156). In the meantime the
![Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relati Stock Photo](https://c8.alamy.com/comp/RWWF0T/embryology-of-insects-and-myriapods-embryology-of-insects-and-myriapods-the-developmental-history-of-insects-centipedes-and-millepedes-from-egg-desposition-!-to-hatching-embryologyofinse00joha-year-1941-384-embryology-of-insects-and-myriapods-ventral-surface-of-the-egg-which-become-lodged-on-the-yolk-surface-at-first-they-are-indistinguishable-from-the-yolk-cells-soon-more-cells-are-liberated-from-the-cumulus-primitivus-and-from-its-vicinity-these-represent-mesoderm-or-mesenchyme-cells-yolk-cells-and-entoderm-cells-probably-arise-chiefly-from-the-ventral-side-of-the-egg-the-relati-RWWF0T.jpg "Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relati Stock Photo")
Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relati Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-of-insects-and-myriapods-embryology-of-insects-and-myriapods-the-developmental-history-of-insects-centipedes-and-millepedes-from-egg-desposition-!-to-hatching-embryologyofinse00joha-year-1941-384-embryology-of-insects-and-myriapods-ventral-surface-of-the-egg-which-become-lodged-on-the-yolk-surface-at-first-they-are-indistinguishable-from-the-yolk-cells-soon-more-cells-are-liberated-from-the-cumulus-primitivus-and-from-its-vicinity-these-represent-mesoderm-or-mesenchyme-cells-yolk-cells-and-entoderm-cells-probably-arise-chiefly-from-the-ventral-side-of-the-egg-the-relati-image239661768.htmlRMRWWF0T–Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 384 EMBRYOLOGY OF INSECTS AND MYRIAPODS ventral surface of the egg which become lodged on the yolk surface. At first they are indistinguishable from the yolk cells. Soon more cells are liberated from the cumulus primitivus and from its vicinity. These represent mesoderm or mesenchyme cells. Yolk cells and entoderm cells probably arise chiefly from the ventral side of the egg. The relati
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . he mother, and aninner layer of mesenchyme.Attached to this inner layer atone side is the small embryo,but .19 mm. in length. It isapparently simple in struct-ure, consisting of an epithelialplate facing the small amnioticcavity lined by flat epithelialcells, which are continuouswith the epithelial cells of theplate. On the other side ofthe plate is a layer of mesen-chyme, and projecting fromthis is the yolk sac lined byentodermal cells. The epithe-lial jilate of th Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-reference-handbook-of-the-medical-sciences-embracing-the-entire-range-of-scientific-and-practical-medicine-and-allied-science-he-mother-and-aninner-layer-of-mesenchymeattached-to-this-inner-layer-atone-side-is-the-small-embryobut-19-mm-in-length-it-isapparently-simple-in-struct-ure-consisting-of-an-epithelialplate-facing-the-small-amnioticcavity-lined-by-flat-epithelialcells-which-are-continuouswith-the-epithelial-cells-of-theplate-on-the-other-side-ofthe-plate-is-a-layer-of-mesen-chyme-and-projecting-fromthis-is-the-yolk-sac-lined-byentodermal-cells-the-epithe-lial-jilate-of-th-image338337745.htmlRM2AJCH6W–A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . he mother, and aninner layer of mesenchyme.Attached to this inner layer atone side is the small embryo,but .19 mm. in length. It isapparently simple in struct-ure, consisting of an epithelialplate facing the small amnioticcavity lined by flat epithelialcells, which are continuouswith the epithelial cells of theplate. On the other side ofthe plate is a layer of mesen-chyme, and projecting fromthis is the yolk sac lined byentodermal cells. The epithe-lial jilate of th
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 417 a separate component. Schauinsland has interpreted it as the homologue of the hsemal arches of reptilia (e.g., Sphenodon). The membrane represents not only the future bony parts but the Ugaments and periosteum as well. Hence we find that the successive membranous vertebrae are not separate structures but are united by membrane, i.e., condensed mesenchyme, and are distinguishable from the future ligaments at first only by greater condensation. In the stage of Fig. 233, chondrification has alread Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-the-skeleton-417-a-separate-component-schauinsland-has-interpreted-it-as-the-homologue-of-the-hsemal-arches-of-reptilia-eg-sphenodon-the-membrane-represents-not-only-the-future-bony-parts-but-the-ugaments-and-periosteum-as-well-hence-we-find-that-the-successive-membranous-vertebrae-are-not-separate-structures-but-are-united-by-membrane-ie-condensed-mesenchyme-and-are-distinguishable-from-the-future-ligaments-at-first-only-by-greater-condensation-in-the-stage-of-fig-233-chondrification-has-alread-image215957837.htmlRMPF9MBW–. The development of the chick; an introduction to embryology. Birds -- Embryology. THE SKELETON 417 a separate component. Schauinsland has interpreted it as the homologue of the hsemal arches of reptilia (e.g., Sphenodon). The membrane represents not only the future bony parts but the Ugaments and periosteum as well. Hence we find that the successive membranous vertebrae are not separate structures but are united by membrane, i.e., condensed mesenchyme, and are distinguishable from the future ligaments at first only by greater condensation. In the stage of Fig. 233, chondrification has alread
The elements of experimental embryology The elements of experimental embryology elementsofexperi00huxl Year: 1963 The endo-mesoderm on the other hand bears a considerable resemblance to an embryo, showing well-marked regions—a head and gill-region with gill-clefts, a trunk-region, and a tail-region. However, it is entirely abnormal in its detailed structure. It is morphologically inside-out; its outer layer is endodermal, and this contains a more or less solid mass of notochord, somites, mesenchyme and cartilage (figs. 213, 216). The endodermal epithelium is, as in the normal embryo, polarise Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-elements-of-experimental-embryology-the-elements-of-experimental-embryology-elementsofexperi00huxl-year-1963-the-endo-mesoderm-on-the-other-hand-bears-a-considerable-resemblance-to-an-embryo-showing-well-marked-regionsa-head-and-gill-region-with-gill-clefts-a-trunk-region-and-a-tail-region-however-it-is-entirely-abnormal-in-its-detailed-structure-it-is-morphologically-inside-out-its-outer-layer-is-endodermal-and-this-contains-a-more-or-less-solid-mass-of-notochord-somites-mesenchyme-and-cartilage-figs-213-216-the-endodermal-epithelium-is-as-in-the-normal-embryo-polarise-image239664858.htmlRMRWWJY6–The elements of experimental embryology The elements of experimental embryology elementsofexperi00huxl Year: 1963 The endo-mesoderm on the other hand bears a considerable resemblance to an embryo, showing well-marked regions—a head and gill-region with gill-clefts, a trunk-region, and a tail-region. However, it is entirely abnormal in its detailed structure. It is morphologically inside-out; its outer layer is endodermal, and this contains a more or less solid mass of notochord, somites, mesenchyme and cartilage (figs. 213, 216). The endodermal epithelium is, as in the normal embryo, polarise
The porifera and coelentera . last). (After Se-liMika, from Korschelt andHeider.) be considered as yet sufficiently ascertained to warrant a finalconclusion. According to observations made in some groups,mesenchyme is largely derived from epiblast, in others from hypo-blast (Fig. 16), in others its appearance in the blastocwl or spaceof the primitive embryonic vesicle precedes the formation of archen-teron itself (Fig. 17). I think that we are bound to bring intoconsideration here the existence in many Cwlentera of a tissueresembling the mesenchyme of Cadomoccela. In Scyphomedusae,in Ctenophor Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-porifera-and-coelentera-last-after-se-limika-from-korschelt-andheider-be-considered-as-yet-sufficiently-ascertained-to-warrant-a-finalconclusion-according-to-observations-made-in-some-groupsmesenchyme-is-largely-derived-from-epiblast-in-others-from-hypo-blast-fig-16-in-others-its-appearance-in-the-blastocwl-or-spaceof-the-primitive-embryonic-vesicle-precedes-the-formation-of-archen-teron-itself-fig-17-i-think-that-we-are-bound-to-bring-intoconsideration-here-the-existence-in-many-cwlentera-of-a-tissueresembling-the-mesenchyme-of-cadomoccela-in-scyphomedusaein-ctenophor-image343381975.htmlRM2AXJB5Y–The porifera and coelentera . last). (After Se-liMika, from Korschelt andHeider.) be considered as yet sufficiently ascertained to warrant a finalconclusion. According to observations made in some groups,mesenchyme is largely derived from epiblast, in others from hypo-blast (Fig. 16), in others its appearance in the blastocwl or spaceof the primitive embryonic vesicle precedes the formation of archen-teron itself (Fig. 17). I think that we are bound to bring intoconsideration here the existence in many Cwlentera of a tissueresembling the mesenchyme of Cadomoccela. In Scyphomedusae,in Ctenophor
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 272 DEVELOPMENT OF THE LYMPHATIC SYSTEM is formed by the fusion of spaces appearing in the mesenchyme immediately external to the intima of degenerating veins; hence the spaces are termed extraintimal spaces. These at first have no endothelial lining and they are never in connection with the lumina of the veins. They are perfectly independent structures and any connections they may«nake with the venous system are entirely secondary. This mode of origin from extraintimal spaces is not confined Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-272-development-of-the-lymphatic-system-is-formed-by-the-fusion-of-spaces-appearing-in-the-mesenchyme-immediately-external-to-the-intima-of-degenerating-veins-hence-the-spaces-are-termed-extraintimal-spaces-these-at-first-have-no-endothelial-lining-and-they-are-never-in-connection-with-the-lumina-of-the-veins-they-are-perfectly-independent-structures-and-any-connections-they-maynake-with-the-venous-system-are-entirely-secondary-this-mode-of-origin-from-extraintimal-spaces-is-not-confined-image215957825.htmlRMPF9MBD–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 272 DEVELOPMENT OF THE LYMPHATIC SYSTEM is formed by the fusion of spaces appearing in the mesenchyme immediately external to the intima of degenerating veins; hence the spaces are termed extraintimal spaces. These at first have no endothelial lining and they are never in connection with the lumina of the veins. They are perfectly independent structures and any connections they may«nake with the venous system are entirely secondary. This mode of origin from extraintimal spaces is not confined
Embryology (1949) Embryology embryology00bart Year: 1949 DUCTUS VENOSUS VENTRICLE POSTERIOR CARDINAL VEIN DORSAL AORTA ALLANTOIC VEIN Fig. 151. The liver. As we have seen in Chapters 12 and 13, the liver forms in close relationship to the ductus venosus. This vessel forms by the fusion of the vitelline veins just posterior to the sinus venosus. Endodermal outgrowths form around the ductus venosus, which is surrounded by mesenchyme and sup- ported by a dorsal mesentery. The liver finally completely envelops the ductus venosus. Later the vitelline veins lose their connection with this vessel Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-1949-embryology-embryology00bart-year-1949-ductus-venosus-ventricle-posterior-cardinal-vein-dorsal-aorta-allantoic-vein-fig-151-the-liver-as-we-have-seen-in-chapters-12-and-13-the-liver-forms-in-close-relationship-to-the-ductus-venosus-this-vessel-forms-by-the-fusion-of-the-vitelline-veins-just-posterior-to-the-sinus-venosus-endodermal-outgrowths-form-around-the-ductus-venosus-which-is-surrounded-by-mesenchyme-and-sup-ported-by-a-dorsal-mesentery-the-liver-finally-completely-envelops-the-ductus-venosus-later-the-vitelline-veins-lose-their-connection-with-this-vessel-image239621494.htmlRMRWRKJE–Embryology (1949) Embryology embryology00bart Year: 1949 DUCTUS VENOSUS VENTRICLE POSTERIOR CARDINAL VEIN DORSAL AORTA ALLANTOIC VEIN Fig. 151. The liver. As we have seen in Chapters 12 and 13, the liver forms in close relationship to the ductus venosus. This vessel forms by the fusion of the vitelline veins just posterior to the sinus venosus. Endodermal outgrowths form around the ductus venosus, which is surrounded by mesenchyme and sup- ported by a dorsal mesentery. The liver finally completely envelops the ductus venosus. Later the vitelline veins lose their connection with this vessel
Journal of comparative neurology . plate. It should also be recordedthat a few blood vessels have entered the outer surface of the medulla. As inthe previous series the sections have suffered a collapse of the roof plate fromfixation or later preparation of the material. X 39. 78 From a transverse section of a 10 mm. pig embryo through the region ofthe V ganglion. The increased vascularity of the mesenchyme above the roofplate together with the enormous amount of coagulated cerebro-spinal fluid(S.C.F.) in the ventricle are evidences of the factors which have produced theincreased expansion not Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/journal-of-comparative-neurology-plate-it-should-also-be-recordedthat-a-few-blood-vessels-have-entered-the-outer-surface-of-the-medulla-as-inthe-previous-series-the-sections-have-suffered-a-collapse-of-the-roof-plate-fromfixation-or-later-preparation-of-the-material-x-39-78-from-a-transverse-section-of-a-10-mm-pig-embryo-through-the-region-ofthe-v-ganglion-the-increased-vascularity-of-the-mesenchyme-above-the-roofplate-together-with-the-enormous-amount-of-coagulated-cerebro-spinal-fluidscf-in-the-ventricle-are-evidences-of-the-factors-which-have-produced-theincreased-expansion-not-image338082721.htmlRM2AJ0YXW–Journal of comparative neurology . plate. It should also be recordedthat a few blood vessels have entered the outer surface of the medulla. As inthe previous series the sections have suffered a collapse of the roof plate fromfixation or later preparation of the material. X 39. 78 From a transverse section of a 10 mm. pig embryo through the region ofthe V ganglion. The increased vascularity of the mesenchyme above the roofplate together with the enormous amount of coagulated cerebro-spinal fluid(S.C.F.) in the ventricle are evidences of the factors which have produced theincreased expansion not
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF THE JOINTS 189 sternoclavicular, the whole of the central portions of the inter- mediate mesenchyme does not degenerate, but it is converted into a fibro-cartilage, between each surface of which and the adjacent bone there is a cavity. These interarticular cartilages seem, in the sterno-clavicular joints, to represent the sternal ends of a bone existing in lower vertebrates and known as the precoracoid, but it seems doubtful if those of the temporo-mandibular and knee-. Fig. 11 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-development-of-the-joints-189-sternoclavicular-the-whole-of-the-central-portions-of-the-inter-mediate-mesenchyme-does-not-degenerate-but-it-is-converted-into-a-fibro-cartilage-between-each-surface-of-which-and-the-adjacent-bone-there-is-a-cavity-these-interarticular-cartilages-seem-in-the-sterno-clavicular-joints-to-represent-the-sternal-ends-of-a-bone-existing-in-lower-vertebrates-and-known-as-the-precoracoid-but-it-seems-doubtful-if-those-of-the-temporo-mandibular-and-knee-fig-11-image215969676.htmlRMPFA7EM–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. DEVELOPMENT OF THE JOINTS 189 sternoclavicular, the whole of the central portions of the inter- mediate mesenchyme does not degenerate, but it is converted into a fibro-cartilage, between each surface of which and the adjacent bone there is a cavity. These interarticular cartilages seem, in the sterno-clavicular joints, to represent the sternal ends of a bone existing in lower vertebrates and known as the precoracoid, but it seems doubtful if those of the temporo-mandibular and knee-. Fig. 11
The elements of experimental embryology The elements of experimental embryology elementsofexperi00huxl Year: 1963 APPENDIX 483 The endo-mesoderm on the other hand bears a considerable resemblance to an embryo, showing well-marked regions—a head and gill-region with gill-clefts, a trunk-region, and a tail-region. However, it is entirely abnormal in its detailed structure. It is morphologically inside-out; its outer layer is endodermal, and this contains a more or less solid mass of notochord, somites, mesenchyme and cartilage (figs. 213, 216). The endodermal epithelium is, as in the normal Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-elements-of-experimental-embryology-the-elements-of-experimental-embryology-elementsofexperi00huxl-year-1963-appendix-483-the-endo-mesoderm-on-the-other-hand-bears-a-considerable-resemblance-to-an-embryo-showing-well-marked-regionsa-head-and-gill-region-with-gill-clefts-a-trunk-region-and-a-tail-region-however-it-is-entirely-abnormal-in-its-detailed-structure-it-is-morphologically-inside-out-its-outer-layer-is-endodermal-and-this-contains-a-more-or-less-solid-mass-of-notochord-somites-mesenchyme-and-cartilage-figs-213-216-the-endodermal-epithelium-is-as-in-the-normal-image239664857.htmlRMRWWJY5–The elements of experimental embryology The elements of experimental embryology elementsofexperi00huxl Year: 1963 APPENDIX 483 The endo-mesoderm on the other hand bears a considerable resemblance to an embryo, showing well-marked regions—a head and gill-region with gill-clefts, a trunk-region, and a tail-region. However, it is entirely abnormal in its detailed structure. It is morphologically inside-out; its outer layer is endodermal, and this contains a more or less solid mass of notochord, somites, mesenchyme and cartilage (figs. 213, 216). The endodermal epithelium is, as in the normal
The American journal of anatomy . f this stage and thenervous system has very little. In Fig. 21 are shown three taste buds and one neuromast from alarva four or five days after the formation of the mouth opening.The entoderm is still clearly distinguishable from the ectoderm andextends beyond the teeth to the lips. At A in the figure is a taste budstanding near the vomerine teeth. The deep nuclei which show activenuclear changes belong to the ectoderm of the vomerine dentalridge. The two cells with dark nuclei belong to the mesenchyme.These cells and the definite outline of the entoderm show Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-f-this-stage-and-thenervous-system-has-very-little-in-fig-21-are-shown-three-taste-buds-and-one-neuromast-from-alarva-four-or-five-days-after-the-formation-of-the-mouth-openingthe-entoderm-is-still-clearly-distinguishable-from-the-ectoderm-andextends-beyond-the-teeth-to-the-lips-at-a-in-the-figure-is-a-taste-budstanding-near-the-vomerine-teeth-the-deep-nuclei-which-show-activenuclear-changes-belong-to-the-ectoderm-of-the-vomerine-dentalridge-the-two-cells-with-dark-nuclei-belong-to-the-mesenchymethese-cells-and-the-definite-outline-of-the-entoderm-show-image340144762.htmlRM2ANAX36–The American journal of anatomy . f this stage and thenervous system has very little. In Fig. 21 are shown three taste buds and one neuromast from alarva four or five days after the formation of the mouth opening.The entoderm is still clearly distinguishable from the ectoderm andextends beyond the teeth to the lips. At A in the figure is a taste budstanding near the vomerine teeth. The deep nuclei which show activenuclear changes belong to the ectoderm of the vomerine dentalridge. The two cells with dark nuclei belong to the mesenchyme.These cells and the definite outline of the entoderm show
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE EXTERNAL GENITALIA 363 The Development of the External Genitalia.—At about the fifth week, before the urogenital sinus has opened to the exterior, the mesenchyme on its ventral wall begins to thicken, producing a slight projection to the exterior. This eminence, which is known as the genital tubercle (Fig. 219, gt), rapidly increases in size, its extremity becomes somewhat bulbously enlarged (Fig. 221, gl) and a groove, extending to the base of the terminal enlargement, appears upon its v Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-the-external-genitalia-363-the-development-of-the-external-genitaliaat-about-the-fifth-week-before-the-urogenital-sinus-has-opened-to-the-exterior-the-mesenchyme-on-its-ventral-wall-begins-to-thicken-producing-a-slight-projection-to-the-exterior-this-eminence-which-is-known-as-the-genital-tubercle-fig-219-gt-rapidly-increases-in-size-its-extremity-becomes-somewhat-bulbously-enlarged-fig-221-gl-and-a-groove-extending-to-the-base-of-the-terminal-enlargement-appears-upon-its-v-image215969405.htmlRMPFA751–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE EXTERNAL GENITALIA 363 The Development of the External Genitalia.—At about the fifth week, before the urogenital sinus has opened to the exterior, the mesenchyme on its ventral wall begins to thicken, producing a slight projection to the exterior. This eminence, which is known as the genital tubercle (Fig. 219, gt), rapidly increases in size, its extremity becomes somewhat bulbously enlarged (Fig. 221, gl) and a groove, extending to the base of the terminal enlargement, appears upon its v
![The elementary nervous system elementarynervou00park Year: [c1919] 34 THE ELEMENTARY NERVOUS SYSTEM the so-called dermal membrane (Fig. 7), is composed of an external epidermis which is believed to be syncytical and not cellular as heretofore assumed, of an intermedi- ate mesenchyme containing spicules, and of an inner epithelioid membrane forming the lining of the subder- mal cavity. Each pore consists of two parts, the pore or actual opening at the surface and the pore canal, a FIG. 7.—Dermal membrane over a subdermal cavity in the sponge Stylotella seen from the exterior as a somewhat Stock Photo](https://c8.alamy.com/comp/RYG50X/the-elementary-nervous-system-elementarynervou00park-year-c1919-34-the-elementary-nervous-system-the-so-called-dermal-membrane-fig-7-is-composed-of-an-external-epidermis-which-is-believed-to-be-syncytical-and-not-cellular-as-heretofore-assumed-of-an-intermedi-ate-mesenchyme-containing-spicules-and-of-an-inner-epithelioid-membrane-forming-the-lining-of-the-subder-mal-cavity-each-pore-consists-of-two-parts-the-pore-or-actual-opening-at-the-surface-and-the-pore-canal-a-fig-7dermal-membrane-over-a-subdermal-cavity-in-the-sponge-stylotella-seen-from-the-exterior-as-a-somewhat-RYG50X.jpg "The elementary nervous system elementarynervou00park Year: [c1919] 34 THE ELEMENTARY NERVOUS SYSTEM the so-called dermal membrane (Fig. 7), is composed of an external epidermis which is believed to be syncytical and not cellular as heretofore assumed, of an intermedi- ate mesenchyme containing spicules, and of an inner epithelioid membrane forming the lining of the subder- mal cavity. Each pore consists of two parts, the pore or actual opening at the surface and the pore canal, a FIG. 7.—Dermal membrane over a subdermal cavity in the sponge Stylotella seen from the exterior as a somewhat Stock Photo")
The elementary nervous system elementarynervou00park Year: [c1919] 34 THE ELEMENTARY NERVOUS SYSTEM the so-called dermal membrane (Fig. 7), is composed of an external epidermis which is believed to be syncytical and not cellular as heretofore assumed, of an intermedi- ate mesenchyme containing spicules, and of an inner epithelioid membrane forming the lining of the subder- mal cavity. Each pore consists of two parts, the pore or actual opening at the surface and the pore canal, a FIG. 7.—Dermal membrane over a subdermal cavity in the sponge Stylotella seen from the exterior as a somewhat Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-elementary-nervous-system-elementarynervou00park-year-c1919-34-the-elementary-nervous-system-the-so-called-dermal-membrane-fig-7-is-composed-of-an-external-epidermis-which-is-believed-to-be-syncytical-and-not-cellular-as-heretofore-assumed-of-an-intermedi-ate-mesenchyme-containing-spicules-and-of-an-inner-epithelioid-membrane-forming-the-lining-of-the-subder-mal-cavity-each-pore-consists-of-two-parts-the-pore-or-actual-opening-at-the-surface-and-the-pore-canal-a-fig-7dermal-membrane-over-a-subdermal-cavity-in-the-sponge-stylotella-seen-from-the-exterior-as-a-somewhat-image240685674.htmlRMRYG50X–The elementary nervous system elementarynervou00park Year: [c1919] 34 THE ELEMENTARY NERVOUS SYSTEM the so-called dermal membrane (Fig. 7), is composed of an external epidermis which is believed to be syncytical and not cellular as heretofore assumed, of an intermedi- ate mesenchyme containing spicules, and of an inner epithelioid membrane forming the lining of the subder- mal cavity. Each pore consists of two parts, the pore or actual opening at the surface and the pore canal, a FIG. 7.—Dermal membrane over a subdermal cavity in the sponge Stylotella seen from the exterior as a somewhat
A text-book of dental histology and embryology, including laboratory directions . Calcified £cartilage From longitudinal section of a finger of a four months embryo. Only the diaphysisof the second phalanx is represented. (85 X) (Szymonowicz.) tissue. This is well illustrated in the mandible. In theregion of Meckels cartilage and between it and the develop-ing tooth germs the mesenchyme begins to show signs of ENDOMEMBRANOUS BONE FORMATION 259 specialization. Delicate fibers appear in the intercellularsubstance. Along these the connective-tissue cells arrangethemselves, and, taking on the form Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-text-book-of-dental-histology-and-embryology-including-laboratory-directions-calcified-cartilage-from-longitudinal-section-of-a-finger-of-a-four-months-embryo-only-the-diaphysisof-the-second-phalanx-is-represented-85-x-szymonowicz-tissue-this-is-well-illustrated-in-the-mandible-in-theregion-of-meckels-cartilage-and-between-it-and-the-develop-ing-tooth-germs-the-mesenchyme-begins-to-show-signs-of-endomembranous-bone-formation-259-specialization-delicate-fibers-appear-in-the-intercellularsubstance-along-these-the-connective-tissue-cells-arrangethemselves-and-taking-on-the-form-image338217073.htmlRM2AJ7395–A text-book of dental histology and embryology, including laboratory directions . Calcified £cartilage From longitudinal section of a finger of a four months embryo. Only the diaphysisof the second phalanx is represented. (85 X) (Szymonowicz.) tissue. This is well illustrated in the mandible. In theregion of Meckels cartilage and between it and the develop-ing tooth germs the mesenchyme begins to show signs of ENDOMEMBRANOUS BONE FORMATION 259 specialization. Delicate fibers appear in the intercellularsubstance. Along these the connective-tissue cells arrangethemselves, and, taking on the form
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 154 DEVELOPMENT OF CONNECTIVE TISSUE represent the cells themselves. Fibrils and material out of which fibrils could be formed have undoubtedly been observed in connec- tive-tissue cells, but whether or not these are later passed to the exterior of the cell to form a connective-tissue fiber is not yet certain, and on this hangs mainly the difference between the theories. Recently it has been held (Mall) that the mesenchyme of the embryo is really a syncytium in and from the protoplasm of whic Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-154-development-of-connective-tissue-represent-the-cells-themselves-fibrils-and-material-out-of-which-fibrils-could-be-formed-have-undoubtedly-been-observed-in-connec-tive-tissue-cells-but-whether-or-not-these-are-later-passed-to-the-exterior-of-the-cell-to-form-a-connective-tissue-fiber-is-not-yet-certain-and-on-this-hangs-mainly-the-difference-between-the-theories-recently-it-has-been-held-mall-that-the-mesenchyme-of-the-embryo-is-really-a-syncytium-in-and-from-the-protoplasm-of-whic-image215969800.htmlRMPFA7K4–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 154 DEVELOPMENT OF CONNECTIVE TISSUE represent the cells themselves. Fibrils and material out of which fibrils could be formed have undoubtedly been observed in connec- tive-tissue cells, but whether or not these are later passed to the exterior of the cell to form a connective-tissue fiber is not yet certain, and on this hangs mainly the difference between the theories. Recently it has been held (Mall) that the mesenchyme of the embryo is really a syncytium in and from the protoplasm of whic
Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 11 Fig. 11 Transverse section of same enibrvcj at level indicated in preeedinj; tisure, X 30(). Hedueed 7. Sliile fi, row 2, section N. 1 Aorta 2 Oniphaloiiiescrileri Angiocyst of intermediate position 6 Coelom Figs. 12 and 13 Ventral view of nioilel of mesoderm, mesenchyme and vas- cular anlages of an embryo of twelve somites. Columbia Collection Xo.o47. The coelomic mesoderm from the nephrotomes laterad has been omitted, to al Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-earlystagesofvas03schuuoft-year-1914-11-fig-11-transverse-section-of-same-enibrvcj-at-level-indicated-in-preeedinj-tisure-x-30-hedueed-7-sliile-fi-row-2-section-n-1-aorta-2-oniphaloiiiescrileri-angiocyst-of-intermediate-position-6-coelom-figs-12-and-13-ventral-view-of-nioilel-of-mesoderm-mesenchyme-and-vas-cular-anlages-of-an-embryo-of-twelve-somites-columbia-collection-xoo47-the-coelomic-mesoderm-from-the-nephrotomes-laterad-has-been-omitted-to-al-image240668539.htmlRMRYFB4Y–Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 11 Fig. 11 Transverse section of same enibrvcj at level indicated in preeedinj; tisure, X 30(). Hedueed 7. Sliile fi, row 2, section N. 1 Aorta 2 Oniphaloiiiescrileri Angiocyst of intermediate position 6 Coelom Figs. 12 and 13 Ventral view of nioilel of mesoderm, mesenchyme and vas- cular anlages of an embryo of twelve somites. Columbia Collection Xo.o47. The coelomic mesoderm from the nephrotomes laterad has been omitted, to al
The development of the human body; a manual of human embryology . Fig. 252.—Early Stage in the Development of the Lens in a Rabbit Embryo.The nucleated layer to the left is the ectoderm and the thicker lens epithelium, below which is the outer wall of the optic evagination; above and below between the two is mesenchyme.—(Rabl.) In the mean time further changes have been taking placein the lens. The ectodermal depression which represents 478 THE DEVELOPMENT OF THE HUMAN BODY. it gradually deepens to form a cup, the lips of which ap-proximate and finally meet, so that the cup is convertedinto a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-fig-252early-stage-in-the-development-of-the-lens-in-a-rabbit-embryothe-nucleated-layer-to-the-left-is-the-ectoderm-and-the-thicker-lens-epithelium-below-which-is-the-outer-wall-of-the-optic-evagination-above-and-below-between-the-two-is-mesenchymerabl-in-the-mean-time-further-changes-have-been-taking-placein-the-lens-the-ectodermal-depression-which-represents-478-the-development-of-the-human-body-it-gradually-deepens-to-form-a-cup-the-lips-of-which-ap-proximate-and-finally-meet-so-that-the-cup-is-convertedinto-a-image340302509.htmlRM2ANJ391–The development of the human body; a manual of human embryology . Fig. 252.—Early Stage in the Development of the Lens in a Rabbit Embryo.The nucleated layer to the left is the ectoderm and the thicker lens epithelium, below which is the outer wall of the optic evagination; above and below between the two is mesenchyme.—(Rabl.) In the mean time further changes have been taking placein the lens. The ectodermal depression which represents 478 THE DEVELOPMENT OF THE HUMAN BODY. it gradually deepens to form a cup, the lips of which ap-proximate and finally meet, so that the cup is convertedinto a
. A manual of zoology. Zoology. GENERAL HISTOLOGY 75 distinctions between the various kinds rest chiefly upon the differences of this intercellular substance. The following forms are distinguished: (i) cellular connective tissue; (2) homogeijeous connccdve tissue; (3) fibrous connective dssue; (4) cartilage; (5) bone. Cellular Connective Tissue (which, strictly speaking, does not belong here, since it does not arise from mesenchyme but directly from the metamorphosis of epithelium) shows the characteristics of the group least disdncdy. It owes its name to the fact that the cells make up the ch Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-general-histology-75-distinctions-between-the-various-kinds-rest-chiefly-upon-the-differences-of-this-intercellular-substance-the-following-forms-are-distinguished-i-cellular-connective-tissue-2-homogeijeous-connccdve-tissue-3-fibrous-connective-dssue-4-cartilage-5-bone-cellular-connective-tissue-which-strictly-speaking-does-not-belong-here-since-it-does-not-arise-from-mesenchyme-but-directly-from-the-metamorphosis-of-epithelium-shows-the-characteristics-of-the-group-least-disdncdy-it-owes-its-name-to-the-fact-that-the-cells-make-up-the-ch-image216442886.htmlRMPG3R32–. A manual of zoology. Zoology. GENERAL HISTOLOGY 75 distinctions between the various kinds rest chiefly upon the differences of this intercellular substance. The following forms are distinguished: (i) cellular connective tissue; (2) homogeijeous connccdve tissue; (3) fibrous connective dssue; (4) cartilage; (5) bone. Cellular Connective Tissue (which, strictly speaking, does not belong here, since it does not arise from mesenchyme but directly from the metamorphosis of epithelium) shows the characteristics of the group least disdncdy. It owes its name to the fact that the cells make up the ch
Embryology (1949) Embryology embryology00bart Year: 1949 MESENCHYME VENTRAL AORTA Fig. 131. A section through the mesencephalon of a 33-hour chick embryo. The foregut is a V-shaped cavity, and its ventral border is in contact with the head epidermis. Above the foregut are the dorsal aortae and below, the ventral aortae. The future aortic arches will connect these vessels. DORSAL AORTA DORSAL MESOCARDIUM EPIMYOCARDIUM ENDOCARDIUM Fig. 132. The heart region of a 33-hour chick embryo. The thick-walled epimyocardium has closed in around the very thin-walled endocardium. Dorsally the heart rema Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-1949-embryology-embryology00bart-year-1949-mesenchyme-ventral-aorta-fig-131-a-section-through-the-mesencephalon-of-a-33-hour-chick-embryo-the-foregut-is-a-v-shaped-cavity-and-its-ventral-border-is-in-contact-with-the-head-epidermis-above-the-foregut-are-the-dorsal-aortae-and-below-the-ventral-aortae-the-future-aortic-arches-will-connect-these-vessels-dorsal-aorta-dorsal-mesocardium-epimyocardium-endocardium-fig-132-the-heart-region-of-a-33-hour-chick-embryo-the-thick-walled-epimyocardium-has-closed-in-around-the-very-thin-walled-endocardium-dorsally-the-heart-rema-image239619514.htmlRMRWRH3P–Embryology (1949) Embryology embryology00bart Year: 1949 MESENCHYME VENTRAL AORTA Fig. 131. A section through the mesencephalon of a 33-hour chick embryo. The foregut is a V-shaped cavity, and its ventral border is in contact with the head epidermis. Above the foregut are the dorsal aortae and below, the ventral aortae. The future aortic arches will connect these vessels. DORSAL AORTA DORSAL MESOCARDIUM EPIMYOCARDIUM ENDOCARDIUM Fig. 132. The heart region of a 33-hour chick embryo. The thick-walled epimyocardium has closed in around the very thin-walled endocardium. Dorsally the heart rema
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. —Ascidia mcntula, the right side.at. Atrial aperture; hr, bran-chial aperture; /, test. Tbe Test posterior end and pene-trated by the two aper- tures, is the test. This is afirm gelatinous cuticular secretionupon the outer surface of theectoderm, which Is a layer of flat cells. Although at first producedas a cuticle, the test soon becomes organized by the migration intoit of cells derived from the mesoderm. A. Kowalevsky has shownthat cells of the mesenchyme of the larva make their way throug Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-encyclopdia-britannica-a-dictionary-of-arts-sciences-literature-and-general-information-fig-ascidia-mcntula-the-right-sideat-atrial-aperture-hr-bran-chial-aperture-test-tbe-test-posterior-end-and-pene-trated-by-the-two-aper-tures-is-the-test-this-is-afirm-gelatinous-cuticular-secretionupon-the-outer-surface-of-theectoderm-which-is-a-layer-of-flat-cells-although-at-first-producedas-a-cuticle-the-test-soon-becomes-organized-by-the-migration-intoit-of-cells-derived-from-the-mesoderm-a-kowalevsky-has-shownthat-cells-of-the-mesenchyme-of-the-larva-make-their-way-throug-image339228350.htmlRM2AKW566–The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. —Ascidia mcntula, the right side.at. Atrial aperture; hr, bran-chial aperture; /, test. Tbe Test posterior end and pene-trated by the two aper- tures, is the test. This is afirm gelatinous cuticular secretionupon the outer surface of theectoderm, which Is a layer of flat cells. Although at first producedas a cuticle, the test soon becomes organized by the migration intoit of cells derived from the mesoderm. A. Kowalevsky has shownthat cells of the mesenchyme of the larva make their way throug
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 334 THE LARYNX In later stages the various bronchi of each lobe give rise to additional branches and these again to others, and the mesenchyme of each lobe grows in between the various branches. At first the amount of mesenchyme separating the branches is comparatively great, but as the branches continue, the growth of the mesenchyme fails to keep pace with it, so that in later stages the terminal enlarge- ments are separated from one another by only very thin partitions of mesenchyme, in whi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-334-the-larynx-in-later-stages-the-various-bronchi-of-each-lobe-give-rise-to-additional-branches-and-these-again-to-others-and-the-mesenchyme-of-each-lobe-grows-in-between-the-various-branches-at-first-the-amount-of-mesenchyme-separating-the-branches-is-comparatively-great-but-as-the-branches-continue-the-growth-of-the-mesenchyme-fails-to-keep-pace-with-it-so-that-in-later-stages-the-terminal-enlarge-ments-are-separated-from-one-another-by-only-very-thin-partitions-of-mesenchyme-in-whi-image215957688.htmlRMPF9M6G–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 334 THE LARYNX In later stages the various bronchi of each lobe give rise to additional branches and these again to others, and the mesenchyme of each lobe grows in between the various branches. At first the amount of mesenchyme separating the branches is comparatively great, but as the branches continue, the growth of the mesenchyme fails to keep pace with it, so that in later stages the terminal enlarge- ments are separated from one another by only very thin partitions of mesenchyme, in whi
Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 FiS- •') Transverse sootion of lui embryo of two somites ;it the level iiuli- eated in Figure 3. Slide .5, row 1, section 0, X 300. Reduced J-. 1 Ectoderm 2 Mesoderm 3 Entoderm 4 Hypectodennal mesenchyme 5 Hypercntodermal mesenchyme 6 Coelom 7 Xeural plate Fig. (J Dorsal view of model of mesoderm ^white), mesenchyme (green) and vasofactive cells (yellow) of an embryo of four somites. Columbia collection No. 409, X 300. Reduced ! Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/early-stages-of-vasculogenesis-in-the-cat-felis-domestica-with-especial-reference-to-the-mesenschymal-origin-of-endothelium-earlystagesofvas03schuuoft-year-1914-fis-transverse-sootion-of-lui-embryo-of-two-somites-it-the-level-iiuli-eated-in-figure-3-slide-5-row-1-section-0-x-300-reduced-j-1-ectoderm-2-mesoderm-3-entoderm-4-hypectodennal-mesenchyme-5-hypercntodermal-mesenchyme-6-coelom-7-xeural-plate-fig-j-dorsal-view-of-model-of-mesoderm-white-mesenchyme-green-and-vasofactive-cells-yellow-of-an-embryo-of-four-somites-columbia-collection-no-409-x-300-reduced-!-image240691943.htmlRMRYGD0R–Early stages of vasculogenesis in the cat (Felis domestica) with especial reference to the mesenschymal origin of endothelium earlystagesofvas03schuuoft Year: 1914 FiS- •') Transverse sootion of lui embryo of two somites ;it the level iiuli- eated in Figure 3. Slide .5, row 1, section 0, X 300. Reduced J-. 1 Ectoderm 2 Mesoderm 3 Entoderm 4 Hypectodennal mesenchyme 5 Hypercntodermal mesenchyme 6 Coelom 7 Xeural plate Fig. (J Dorsal view of model of mesoderm ^white), mesenchyme (green) and vasofactive cells (yellow) of an embryo of four somites. Columbia collection No. 409, X 300. Reduced !
The development of the human body; a manual of human embryology . gn of de-velopment visible in the testis is a multiplication of the epithelial cells to form a thicklayer, into the under surfaceof which deep bays extendfrom the subjacent mesen-chyme, producing the appear-ance of cords of cells extend-ing into the mesenchyme fromthe epithelium. These cords(Fig. 202, ec) consist of twokinds of cells, (1) elongatedcells with a small amount ofprotoplasm, the epithelialcells, and (2) large sphericalcells with more abundant,clear protoplasm, and termedsexual cells. While the development isat this s Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-gn-of-de-velopment-visible-in-the-testis-is-a-multiplication-of-the-epithelial-cells-to-form-a-thicklayer-into-the-under-surfaceof-which-deep-bays-extendfrom-the-subjacent-mesen-chyme-producing-the-appear-ance-of-cords-of-cells-extend-ing-into-the-mesenchyme-fromthe-epithelium-these-cordsfig-202-ec-consist-of-twokinds-of-cells-1-elongatedcells-with-a-small-amount-ofprotoplasm-the-epithelialcells-and-2-large-sphericalcells-with-more-abundantclear-protoplasm-and-termedsexual-cells-while-the-development-isat-this-s-image342650402.htmlRM2AWD22A–The development of the human body; a manual of human embryology . gn of de-velopment visible in the testis is a multiplication of the epithelial cells to form a thicklayer, into the under surfaceof which deep bays extendfrom the subjacent mesen-chyme, producing the appear-ance of cords of cells extend-ing into the mesenchyme fromthe epithelium. These cords(Fig. 202, ec) consist of twokinds of cells, (1) elongatedcells with a small amount ofprotoplasm, the epithelialcells, and (2) large sphericalcells with more abundant,clear protoplasm, and termedsexual cells. While the development isat this s
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there are five, viz.: (1) the mandibular in front of the first pouch, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-from-twelve-to-thirty-six-somites-175-visceral-furrows-in-front-of-the-first-at-the-14-16-s-stage-these-he-in-terprets-as-phyletic-rudiments-it-is-certain-that-the-lower-vertebrates-had-pouches-posterior-to-the-fourth-the-post-branchial-bodies-see-p-309-are-probably-rudiments-of-a-fifth-pair-of-pouches-the-tissue-between-the-visceral-pouches-thickens-by-accumu-lation-of-mesenchyme-to-form-the-visceral-arches-of-which-there-are-five-viz-1-the-mandibular-in-front-of-the-first-pouch-image215970071.htmlRMPFA80R–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there are five, viz.: (1) the mandibular in front of the first pouch,
. The American journal of anatomy. amount of the surrounding mesenchyme, stained in Dela- Tlie literature on the general subject of the development of the peripheral nervesin vertebrates has been recently reviewed by Harrison, Dohrn, Fiirbringer andNussbaum, each from a different standpoint. 233 Growth and TTistoffonesis of Nerves fields liEematoxylin, followed by Congo-red, dehydrated, cleared, andthen mounted in balsam. Clearer pictures may thus be obtained inearly embryos than by the osmic-acid, picro-carmine method used byVignal. In a specimen thus prepared (Fig. 1), the bundles of nerve-f Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-amount-of-the-surrounding-mesenchyme-stained-in-dela-tlie-literature-on-the-general-subject-of-the-development-of-the-peripheral-nervesin-vertebrates-has-been-recently-reviewed-by-harrison-dohrn-fiirbringer-andnussbaum-each-from-a-different-standpoint-233-growth-and-ttistoffonesis-of-nerves-fields-lieematoxylin-followed-by-congo-red-dehydrated-cleared-andthen-mounted-in-balsam-clearer-pictures-may-thus-be-obtained-inearly-embryos-than-by-the-osmic-acid-picro-carmine-method-used-byvignal-in-a-specimen-thus-prepared-fig-1-the-bundles-of-nerve-f-image336910944.htmlRM2AG3H9M–. The American journal of anatomy. amount of the surrounding mesenchyme, stained in Dela- Tlie literature on the general subject of the development of the peripheral nervesin vertebrates has been recently reviewed by Harrison, Dohrn, Fiirbringer andNussbaum, each from a different standpoint. 233 Growth and TTistoffonesis of Nerves fields liEematoxylin, followed by Congo-red, dehydrated, cleared, andthen mounted in balsam. Clearer pictures may thus be obtained inearly embryos than by the osmic-acid, picro-carmine method used byVignal. In a specimen thus prepared (Fig. 1), the bundles of nerve-f
![. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be traced inward for some distance between successive somites over both their anterior Stock Photo](https://c8.alamy.com/comp/PFA8E1/the-development-of-the-frogs-egg-an-introduction-to-experimental-embryology-embryology-ch-xiv-organs-from-the-mesoderm-149-outer-side-of-each-somite-by-tlie-entire-somatic-layer-along-the-ventral-and-median-boundaries-of-the-somites-a-layer-having-a-loose-epithelial-character-mesenchyme-is-also-to-be-seen-thus-the-central-mass-whicli-is-to-develop-into-the-myotome-lies-on-the-median-side-of-the-coelom-and-is-wholly-surrounded-by-an-epithelial-layer-frontal-sections-show-that-this-layer-can-also-be-traced-inward-for-some-distance-between-successive-somites-over-both-their-anterior-PFA8E1.jpg ". The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be traced inward for some distance between successive somites over both their anterior Stock Photo")
. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be traced inward for some distance between successive somites over both their anterior Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-frogs-egg-an-introduction-to-experimental-embryology-embryology-ch-xiv-organs-from-the-mesoderm-149-outer-side-of-each-somite-by-tlie-entire-somatic-layer-along-the-ventral-and-median-boundaries-of-the-somites-a-layer-having-a-loose-epithelial-character-mesenchyme-is-also-to-be-seen-thus-the-central-mass-whicli-is-to-develop-into-the-myotome-lies-on-the-median-side-of-the-coelom-and-is-wholly-surrounded-by-an-epithelial-layer-frontal-sections-show-that-this-layer-can-also-be-traced-inward-for-some-distance-between-successive-somites-over-both-their-anterior-image215970441.htmlRMPFA8E1–. The development of the frog's egg; an introduction to experimental embryology. Embryology. Ch. XIV] ORGANS FROM THE MESODERM 149 outer side of each somite by tlie entire somatic layer. Along the ventral and median boundaries of the somites a layer having a loose epithelial character (mesenchyme) is also to be seen. Thus the central mass whicli is to develop into the myotome lies on the median side of the coelom, and is wholly surrounded by an epithelial layer. Frontal sections show that this layer can also be traced inward for some distance between successive somites over both their anterior
A treatise on zoology . s of the gastrula wall (ectoderm), and so form mesenchyme, from whichmesod(Miu tissue is ultimately developed (Fig. VI. >). Thearclienteron occupies but a small part of the segmentation cavity,its lumen is usually narrow, and the external oj)ening forms asmall blastopores, which in Antedon soon closes. Both endodermand ectoderm arts usually ciliated f,(»m the beginning; but inAiiffidini. cilia appear only on the ectoderm after gastrulation. ihe larva becomes bilaterally synunetrical by dorso-ventralcomprtsssion and the foi-ination of a vential concavity. The inner. E Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-treatise-on-zoology-s-of-the-gastrula-wall-ectoderm-and-so-form-mesenchyme-from-whichmesodmiu-tissue-is-ultimately-developed-fig-vi-gt-thearclienteron-occupies-but-a-small-part-of-the-segmentation-cavityits-lumen-is-usually-narrow-and-the-external-ojening-forms-asmall-blastopores-which-in-antedon-soon-closes-both-endodermand-ectoderm-arts-usually-ciliated-fm-the-beginning-but-inaiiffidini-cilia-appear-only-on-the-ectoderm-after-gastrulation-ihe-larva-becomes-bilaterally-synunetrical-by-dorso-ventralcomprtsssion-and-the-foi-ination-of-a-vential-concavity-the-inner-e-image340241960.htmlRM2ANFA2G–A treatise on zoology . s of the gastrula wall (ectoderm), and so form mesenchyme, from whichmesod(Miu tissue is ultimately developed (Fig. VI. >). Thearclienteron occupies but a small part of the segmentation cavity,its lumen is usually narrow, and the external oj)ening forms asmall blastopores, which in Antedon soon closes. Both endodermand ectoderm arts usually ciliated f,(»m the beginning; but inAiiffidini. cilia appear only on the ectoderm after gastrulation. ihe larva becomes bilaterally synunetrical by dorso-ventralcomprtsssion and the foi-ination of a vential concavity. The inner. E
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-forming-cells-image215970287.htmlRMPFA88F–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells
. The American journal of anatomy. cellsseems to he identical so far as optical appearances are concerned withthat in the ^ligment layer. The nuclei, the staining and the general ap-pearance of these cells, aside from the pigment, indicate that they areother than the ordinary branched mesenchyme cells. As the buds con-tinue to grow the knob-like ends may send out liranches and elongate ormay remain spherical for a while, at least after the disappearance ofthe connecting pedicle between it and the pigment layer. In Fig. 1, from a chick 6 days and 13 hours old, is a I)ud a nar-row pedicle Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-cellsseems-to-he-identical-so-far-as-optical-appearances-are-concerned-withthat-in-the-ligment-layer-the-nuclei-the-staining-and-the-general-ap-pearance-of-these-cells-aside-from-the-pigment-indicate-that-they-areother-than-the-ordinary-branched-mesenchyme-cells-as-the-buds-con-tinue-to-grow-the-knob-like-ends-may-send-out-liranches-and-elongate-ormay-remain-spherical-for-a-while-at-least-after-the-disappearance-ofthe-connecting-pedicle-between-it-and-the-pigment-layer-in-fig-1-from-a-chick-6-days-and-13-hours-old-is-a-iud-a-nar-row-pedicle-image336890554.htmlRM2AG2K9E–. The American journal of anatomy. cellsseems to he identical so far as optical appearances are concerned withthat in the ^ligment layer. The nuclei, the staining and the general ap-pearance of these cells, aside from the pigment, indicate that they areother than the ordinary branched mesenchyme cells. As the buds con-tinue to grow the knob-like ends may send out liranches and elongate ormay remain spherical for a while, at least after the disappearance ofthe connecting pedicle between it and the pigment layer. In Fig. 1, from a chick 6 days and 13 hours old, is a I)ud a nar-row pedicle
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 142 DEVELOPMENT OF THE SKIN Malpighii. At about the fourth month ridges develop on the under surface of the epidermis, projecting downward into the dermis, and later secondary ridges appear in the intervals between the primary ones, while on the palms and soles ridges appear upon the outer surface of the epidermis, corresponding in position to the primary ridges of the under surface. The mesenchyme which gives rise to the dermis grows in from all sides between the epidermis and the outer laye Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-142-development-of-the-skin-malpighii-at-about-the-fourth-month-ridges-develop-on-the-under-surface-of-the-epidermis-projecting-downward-into-the-dermis-and-later-secondary-ridges-appear-in-the-intervals-between-the-primary-ones-while-on-the-palms-and-soles-ridges-appear-upon-the-outer-surface-of-the-epidermis-corresponding-in-position-to-the-primary-ridges-of-the-under-surface-the-mesenchyme-which-gives-rise-to-the-dermis-grows-in-from-all-sides-between-the-epidermis-and-the-outer-laye-image215969827.htmlRMPFA7M3–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 142 DEVELOPMENT OF THE SKIN Malpighii. At about the fourth month ridges develop on the under surface of the epidermis, projecting downward into the dermis, and later secondary ridges appear in the intervals between the primary ones, while on the palms and soles ridges appear upon the outer surface of the epidermis, corresponding in position to the primary ridges of the under surface. The mesenchyme which gives rise to the dermis grows in from all sides between the epidermis and the outer laye
The Journal of experimental zoology . ively of one and thesame embryo, drawn 19 hours after the operation. A mass of cellular debris lies between the two halfembryos; the endoderm cells are chiefly contained in the anterior half, the mesenchyme and musclecells are entirely confined to the posterior half. Neither half at all resembles a normal embryo or larva.Figs. 79, 80. Ventral and postero-dorsal views of another embryo, 19^ hours after the operation.The crescent of yellow cells is entirely confined to the posterior half and neither half resembles a normallarva. Fig. 81. Anterior and posteri Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-journal-of-experimental-zoology-ively-of-one-and-thesame-embryo-drawn-19-hours-after-the-operation-a-mass-of-cellular-debris-lies-between-the-two-halfembryos-the-endoderm-cells-are-chiefly-contained-in-the-anterior-half-the-mesenchyme-and-musclecells-are-entirely-confined-to-the-posterior-half-neither-half-at-all-resembles-a-normal-embryo-or-larvafigs-79-80-ventral-and-postero-dorsal-views-of-another-embryo-19-hours-after-the-operationthe-crescent-of-yellow-cells-is-entirely-confined-to-the-posterior-half-and-neither-half-resembles-a-normallarva-fig-81-anterior-and-posteri-image340242158.htmlRM2ANFA9J–The Journal of experimental zoology . ively of one and thesame embryo, drawn 19 hours after the operation. A mass of cellular debris lies between the two halfembryos; the endoderm cells are chiefly contained in the anterior half, the mesenchyme and musclecells are entirely confined to the posterior half. Neither half at all resembles a normal embryo or larva.Figs. 79, 80. Ventral and postero-dorsal views of another embryo, 19^ hours after the operation.The crescent of yellow cells is entirely confined to the posterior half and neither half resembles a normallarva. Fig. 81. Anterior and posteri
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 464 THE ANTERIOR CHAMBER OF THE EYE more numerous laterally than at the center, are embedded. Still later cells from the adjacent mesenchyme grow into the layer, which increases considerably in thickness, and blood-vessels also grow into that portion of it which is in contact with the outer surface of the lens. At this stage the interval between the surface ectoderm and the lens is occupied by a solid mass of mesodermal tissue (Fig. 278, co and tv), but as development proceeds, small spaces ( Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-464-the-anterior-chamber-of-the-eye-more-numerous-laterally-than-at-the-center-are-embedded-still-later-cells-from-the-adjacent-mesenchyme-grow-into-the-layer-which-increases-considerably-in-thickness-and-blood-vessels-also-grow-into-that-portion-of-it-which-is-in-contact-with-the-outer-surface-of-the-lens-at-this-stage-the-interval-between-the-surface-ectoderm-and-the-lens-is-occupied-by-a-solid-mass-of-mesodermal-tissue-fig-278-co-and-tv-but-as-development-proceeds-small-spaces-image215969174.htmlRMPFA6TP–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 464 THE ANTERIOR CHAMBER OF THE EYE more numerous laterally than at the center, are embedded. Still later cells from the adjacent mesenchyme grow into the layer, which increases considerably in thickness, and blood-vessels also grow into that portion of it which is in contact with the outer surface of the lens. At this stage the interval between the surface ectoderm and the lens is occupied by a solid mass of mesodermal tissue (Fig. 278, co and tv), but as development proceeds, small spaces (
The Journal of experimental zoology . ots are present. Fig. 35. Left-anterior three-quarter embryo, dorsal view; the right posterior quadrant (B^) waskilled in the 4-cell stage and the embryo fixed 6 hours later. The anterior half of the embryo is entirelynormal. The muscle cells are lacking on the right side though they have begun to grow around thehinder end of the notochord. The posterior portion of the trunk mesenchyme is found only on the leftside, but its anterior portion, which is derived from the cells A-^ and A^* (Fig. 6) of the anterior quad-rants is present on both sides. In the reg Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-journal-of-experimental-zoology-ots-are-present-fig-35-left-anterior-three-quarter-embryo-dorsal-view-the-right-posterior-quadrant-b-waskilled-in-the-4-cell-stage-and-the-embryo-fixed-6-hours-later-the-anterior-half-of-the-embryo-is-entirelynormal-the-muscle-cells-are-lacking-on-the-right-side-though-they-have-begun-to-grow-around-thehinder-end-of-the-notochord-the-posterior-portion-of-the-trunk-mesenchyme-is-found-only-on-the-leftside-but-its-anterior-portion-which-is-derived-from-the-cells-a-and-a-fig-6-of-the-anterior-quad-rants-is-present-on-both-sides-in-the-reg-image340257448.htmlRM2ANG1RM–The Journal of experimental zoology . ots are present. Fig. 35. Left-anterior three-quarter embryo, dorsal view; the right posterior quadrant (B^) waskilled in the 4-cell stage and the embryo fixed 6 hours later. The anterior half of the embryo is entirelynormal. The muscle cells are lacking on the right side though they have begun to grow around thehinder end of the notochord. The posterior portion of the trunk mesenchyme is found only on the leftside, but its anterior portion, which is derived from the cells A-^ and A^* (Fig. 6) of the anterior quad-rants is present on both sides. In the reg
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 158 DEVELOPMENT OF BONE increases in thickness, there is a gradual absorption of the spongy bone and also of the earlier layers of periosteal bone, this absorption being carried on by large multinucleated cells, termed osteoclasts, derived from the marrow mesenchyme. By their action the bone is enabled to reach its requisite diameter and strength, without becoming an almost solid and unwieldy mass of compact bone. During the ossification of the cartilaginous trabeculse osteoblasts become encl Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-158-development-of-bone-increases-in-thickness-there-is-a-gradual-absorption-of-the-spongy-bone-and-also-of-the-earlier-layers-of-periosteal-bone-this-absorption-being-carried-on-by-large-multinucleated-cells-termed-osteoclasts-derived-from-the-marrow-mesenchyme-by-their-action-the-bone-is-enabled-to-reach-its-requisite-diameter-and-strength-without-becoming-an-almost-solid-and-unwieldy-mass-of-compact-bone-during-the-ossification-of-the-cartilaginous-trabeculse-osteoblasts-become-encl-image215969778.htmlRMPFA7JA–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 158 DEVELOPMENT OF BONE increases in thickness, there is a gradual absorption of the spongy bone and also of the earlier layers of periosteal bone, this absorption being carried on by large multinucleated cells, termed osteoclasts, derived from the marrow mesenchyme. By their action the bone is enabled to reach its requisite diameter and strength, without becoming an almost solid and unwieldy mass of compact bone. During the ossification of the cartilaginous trabeculse osteoblasts become encl
Papers . Published by the Carnegie Institution of W^ashingtonwashington, november, 1922 CARNEGIE INSTITUTION OF WASHINGTONPublication No. 312 DEC 4 TECHNICAL PRESSWASHINGTON, D. C. CONTENTS. PAGE I. Studies on the Hybridization of Echinoids, Cidaris tribuloides. By David H. Tennent. 3 plates, 28 figures 3-20 Part I. Embryology and Hybridization of Cidaris 3 Nature and Systematic Position of the Material 3 Earl J Development of Cidaris tribuloides 5 Rate of Development of Cidaris compared with that of other Echinoids.. 6 Comparison with other Investigations of Cidaris 9 Formation of Mesenchyme Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/papers-published-by-the-carnegie-institution-of-washingtonwashington-november-1922-carnegie-institution-of-washingtonpublication-no-312-dec-4-technical-presswashington-d-c-contents-page-i-studies-on-the-hybridization-of-echinoids-cidaris-tribuloides-by-david-h-tennent-3-plates-28-figures-3-20-part-i-embryology-and-hybridization-of-cidaris-3-nature-and-systematic-position-of-the-material-3-earl-j-development-of-cidaris-tribuloides-5-rate-of-development-of-cidaris-compared-with-that-of-other-echinoids-6-comparison-with-other-investigations-of-cidaris-9-formation-of-mesenchyme-image342822841.htmlRM2AWMX0W–Papers . Published by the Carnegie Institution of W^ashingtonwashington, november, 1922 CARNEGIE INSTITUTION OF WASHINGTONPublication No. 312 DEC 4 TECHNICAL PRESSWASHINGTON, D. C. CONTENTS. PAGE I. Studies on the Hybridization of Echinoids, Cidaris tribuloides. By David H. Tennent. 3 plates, 28 figures 3-20 Part I. Embryology and Hybridization of Cidaris 3 Nature and Systematic Position of the Material 3 Earl J Development of Cidaris tribuloides 5 Rate of Development of Cidaris compared with that of other Echinoids.. 6 Comparison with other Investigations of Cidaris 9 Formation of Mesenchyme
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-image215970117.htmlRMPFA82D–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme
. The American journal of anatomy. with nerve-fibers passing out into the mesenchyme from the latter. Theectoderm in the mid dorsal region dips down into the mesenchyme in theregion from which the brain was removed. X 45 diameters. Fig. 12. Experiment Sp, . Embryo of amblystoma killed 16 days afterhaving had the nasal pit of another embryo transplanted beneath the ecto-derm in the region dorsal to the right eye. Section through right eye andtransplanted nasal pit. Where the nasal pit is in contact with the outerlayer of the optic cup this portion of the outer layer is free from pigmentand in p Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-with-nerve-fibers-passing-out-into-the-mesenchyme-from-the-latter-theectoderm-in-the-mid-dorsal-region-dips-down-into-the-mesenchyme-in-theregion-from-which-the-brain-was-removed-x-45-diameters-fig-12-experiment-sp-embryo-of-amblystoma-killed-16-days-afterhaving-had-the-nasal-pit-of-another-embryo-transplanted-beneath-the-ecto-derm-in-the-region-dorsal-to-the-right-eye-section-through-right-eye-andtransplanted-nasal-pit-where-the-nasal-pit-is-in-contact-with-the-outerlayer-of-the-optic-cup-this-portion-of-the-outer-layer-is-free-from-pigmentand-in-p-image337091297.htmlRM2AGBRAW–. The American journal of anatomy. with nerve-fibers passing out into the mesenchyme from the latter. Theectoderm in the mid dorsal region dips down into the mesenchyme in theregion from which the brain was removed. X 45 diameters. Fig. 12. Experiment Sp, . Embryo of amblystoma killed 16 days afterhaving had the nasal pit of another embryo transplanted beneath the ecto-derm in the region dorsal to the right eye. Section through right eye andtransplanted nasal pit. Where the nasal pit is in contact with the outerlayer of the optic cup this portion of the outer layer is free from pigmentand in p
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE EYE 447 terminal bulb and a stalk connecting the bulb with the brain (Fig. 232). At an early stage the bulb comes into apposition with the ectoderm of the side of the head, and this, over the area of con-. Fig. 266.—Early Stages in the Development of the Lens in a Rabbit Embryo. The nucleated layer to the left is the ectoderm and the thicker lens epithelium, beneath which is the outer wall of the optic evagination; above and below between the two is mesenchyme.—(Rabl.) tact, becomes thick Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-embryology-embryo-non-mammalian-the-eye-447-terminal-bulb-and-a-stalk-connecting-the-bulb-with-the-brain-fig-232-at-an-early-stage-the-bulb-comes-into-apposition-with-the-ectoderm-of-the-side-of-the-head-and-this-over-the-area-of-con-fig-266early-stages-in-the-development-of-the-lens-in-a-rabbit-embryo-the-nucleated-layer-to-the-left-is-the-ectoderm-and-the-thicker-lens-epithelium-beneath-which-is-the-outer-wall-of-the-optic-evagination-above-and-below-between-the-two-is-mesenchymerabl-tact-becomes-thick-image215969232.htmlRMPFA6XT–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE EYE 447 terminal bulb and a stalk connecting the bulb with the brain (Fig. 232). At an early stage the bulb comes into apposition with the ectoderm of the side of the head, and this, over the area of con-. Fig. 266.—Early Stages in the Development of the Lens in a Rabbit Embryo. The nucleated layer to the left is the ectoderm and the thicker lens epithelium, beneath which is the outer wall of the optic evagination; above and below between the two is mesenchyme.—(Rabl.) tact, becomes thick
The development of the human body; a manual of human embryology . directly, forming a suture. When, however, a portion of unmodified mesenchmyeintervenes between two cartilages, the mode of articula-tion of the bones formed from these cartilages will vary.The intermediate mesenchyme may in time undergo chon-drification and unite the bones in an almost immovablearticulation known as a synchondrosis (e. g., the sacro-iliac articulation); or a cavity may appear in the center ofthe intervening cartilage so that a slight amount of move- THE JOINTS. 213 merit of the two bones is possible, forming an Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-directly-forming-a-suture-when-however-a-portion-of-unmodified-mesenchmyeintervenes-between-two-cartilages-the-mode-of-articula-tion-of-the-bones-formed-from-these-cartilages-will-varythe-intermediate-mesenchyme-may-in-time-undergo-chon-drification-and-unite-the-bones-in-an-almost-immovablearticulation-known-as-a-synchondrosis-e-g-the-sacro-iliac-articulation-or-a-cavity-may-appear-in-the-center-ofthe-intervening-cartilage-so-that-a-slight-amount-of-move-the-joints-213-merit-of-the-two-bones-is-possible-forming-an-image342691624.htmlRM2AWEXJG–The development of the human body; a manual of human embryology . directly, forming a suture. When, however, a portion of unmodified mesenchmyeintervenes between two cartilages, the mode of articula-tion of the bones formed from these cartilages will vary.The intermediate mesenchyme may in time undergo chon-drification and unite the bones in an almost immovablearticulation known as a synchondrosis (e. g., the sacro-iliac articulation); or a cavity may appear in the center ofthe intervening cartilage so that a slight amount of move- THE JOINTS. 213 merit of the two bones is possible, forming an
. A manual of zoology. Zoology. Fig. io8.—Larvse of Strongylocenirotus lividus (after Boveri). Left a blaslula witli mesenchyme formation; right a gastrula with differentiated mesenchyme. entoderm becomes widened Ijy the secretion of gelatinous substance, and from the entoderm isolated cells push into this jelly; thus there arises a middle layer, the mesenchyme (fig. io8), somewhat similar to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. The mesenchyme can be formed before the beginning of gastrulation or after that process has been complet Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-io8larvse-of-strongylocenirotus-lividus-after-boveri-left-a-blaslula-witli-mesenchyme-formation-right-a-gastrula-with-differentiated-mesenchyme-entoderm-becomes-widened-ijy-the-secretion-of-gelatinous-substance-and-from-the-entoderm-isolated-cells-push-into-this-jelly-thus-there-arises-a-middle-layer-the-mesenchyme-fig-io8-somewhat-similar-to-gelatinous-connective-tissue-from-which-certain-organs-either-wholly-or-in-part-take-their-origin-the-mesenchyme-can-be-formed-before-the-beginning-of-gastrulation-or-after-that-process-has-been-complet-image216442578.htmlRMPG3PM2–. A manual of zoology. Zoology. Fig. io8.—Larvse of Strongylocenirotus lividus (after Boveri). Left a blaslula witli mesenchyme formation; right a gastrula with differentiated mesenchyme. entoderm becomes widened Ijy the secretion of gelatinous substance, and from the entoderm isolated cells push into this jelly; thus there arises a middle layer, the mesenchyme (fig. io8), somewhat similar to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. The mesenchyme can be formed before the beginning of gastrulation or after that process has been complet
. The American journal of anatomy. ye andlens-bud. The regenerated eye is separated from the ectoderm by mesenchyme.There is an artificial separation of the lens-bud from the inner layer of theectoderm. X 90 diameters. Fig. 37. Experiment DL30. Lens-bud more highly magnified. X 360diameters. Fig. 38. Experiment DL30. Section through normal left eye and lens.X 90 diameters. Fig. 39. Experiment DF-^. Embryo rana palustris killed 5 days afterpartial extirpation of the right optic vesicle. Section through regeneratedright eye showing attachment to brain and separation from ectoderm bymesenchyme. T Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-ye-andlens-bud-the-regenerated-eye-is-separated-from-the-ectoderm-by-mesenchymethere-is-an-artificial-separation-of-the-lens-bud-from-the-inner-layer-of-theectoderm-x-90-diameters-fig-37-experiment-dl30-lens-bud-more-highly-magnified-x-360diameters-fig-38-experiment-dl30-section-through-normal-left-eye-and-lensx-90-diameters-fig-39-experiment-df-embryo-rana-palustris-killed-5-days-afterpartial-extirpation-of-the-right-optic-vesicle-section-through-regeneratedright-eye-showing-attachment-to-brain-and-separation-from-ectoderm-bymesenchyme-t-image337088287.htmlRM2AGBKFB–. The American journal of anatomy. ye andlens-bud. The regenerated eye is separated from the ectoderm by mesenchyme.There is an artificial separation of the lens-bud from the inner layer of theectoderm. X 90 diameters. Fig. 37. Experiment DL30. Lens-bud more highly magnified. X 360diameters. Fig. 38. Experiment DL30. Section through normal left eye and lens.X 90 diameters. Fig. 39. Experiment DF-^. Embryo rana palustris killed 5 days afterpartial extirpation of the right optic vesicle. Section through regeneratedright eye showing attachment to brain and separation from ectoderm bymesenchyme. T
. A manual of zoology. Zoology. Fig. io8.—Larvse of Strongylocenirotus lividus (after Boveri). Left a blaslula witli mesenchyme formation; right a gastrula with differentiated mesenchyme. entoderm becomes widened Ijy the secretion of gelatinous substance, and from the entoderm isolated cells push into this jelly; thus there arises a middle layer, the mesenchyme (fig. io8), somewhat similar to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. The mesenchyme can be formed before the beginning of gastrulation or after that process has been complet Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-io8larvse-of-strongylocenirotus-lividus-after-boveri-left-a-blaslula-witli-mesenchyme-formation-right-a-gastrula-with-differentiated-mesenchyme-entoderm-becomes-widened-ijy-the-secretion-of-gelatinous-substance-and-from-the-entoderm-isolated-cells-push-into-this-jelly-thus-there-arises-a-middle-layer-the-mesenchyme-fig-io8-somewhat-similar-to-gelatinous-connective-tissue-from-which-certain-organs-either-wholly-or-in-part-take-their-origin-the-mesenchyme-can-be-formed-before-the-beginning-of-gastrulation-or-after-that-process-has-been-complet-image216442585.htmlRMPG3PM9–. A manual of zoology. Zoology. Fig. io8.—Larvse of Strongylocenirotus lividus (after Boveri). Left a blaslula witli mesenchyme formation; right a gastrula with differentiated mesenchyme. entoderm becomes widened Ijy the secretion of gelatinous substance, and from the entoderm isolated cells push into this jelly; thus there arises a middle layer, the mesenchyme (fig. io8), somewhat similar to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. The mesenchyme can be formed before the beginning of gastrulation or after that process has been complet
. The American journal of anatomy. sepa-rated from the ectoderm by mesenchyme. The normal side shows the early lens stage. X 90 diameters. Fig. 62. Experiment DF^. Embryo rana palustris killed 4 days afterpartial extirpation of the right optic vesicle. Section through regeneratedeye and small lens vesicle. Normal eye is similar to the one in Fig. 61.X 90 diameters. Fig. 63. Experiment DFjs. Embryo rana palustris killed 4 days afterpartial extirpation of the right optic vesicle. Section through regeneratedeye and small lens vesicle, both are separated from the ectoderm by a layerof mesenchyme. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-american-journal-of-anatomy-sepa-rated-from-the-ectoderm-by-mesenchyme-the-normal-side-shows-the-early-lens-stage-x-90-diameters-fig-62-experiment-df-embryo-rana-palustris-killed-4-days-afterpartial-extirpation-of-the-right-optic-vesicle-section-through-regeneratedeye-and-small-lens-vesicle-normal-eye-is-similar-to-the-one-in-fig-61x-90-diameters-fig-63-experiment-dfjs-embryo-rana-palustris-killed-4-days-afterpartial-extirpation-of-the-right-optic-vesicle-section-through-regeneratedeye-and-small-lens-vesicle-both-are-separated-from-the-ectoderm-by-a-layerof-mesenchyme-image337086672.htmlRM2AGBHDM–. The American journal of anatomy. sepa-rated from the ectoderm by mesenchyme. The normal side shows the early lens stage. X 90 diameters. Fig. 62. Experiment DF^. Embryo rana palustris killed 4 days afterpartial extirpation of the right optic vesicle. Section through regeneratedeye and small lens vesicle. Normal eye is similar to the one in Fig. 61.X 90 diameters. Fig. 63. Experiment DFjs. Embryo rana palustris killed 4 days afterpartial extirpation of the right optic vesicle. Section through regeneratedeye and small lens vesicle, both are separated from the ectoderm by a layerof mesenchyme.
. Cytology, with special reference to the metazoan nucleus. Cells. i MITOSIS 7 somes, each of which subsequently divides into two daughter chromosomes. The original series of chromosomes is thereby duplicated into two exactly. Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus; B, very early prophase; C, D, middle prophase; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase (seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the d Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cytology-with-special-reference-to-the-metazoan-nucleus-cells-i-mitosis-7-somes-each-of-which-subsequently-divides-into-two-daughter-chromosomes-the-original-series-of-chromosomes-is-thereby-duplicated-into-two-exactly-fig-3-mitosis-in-lepidosiren-mesenchyme-cell-a-resting-nucleus-b-very-early-prophase-c-d-middle-prophase-e-late-prophase-the-nuclear-membrane-has-disappeared-and-the-chromosomes-are-becoming-attached-to-the-spindle-fibres-f-metaphase-seen-from-above-only-about-half-of-the-chromosomes-are-shown-g-anaphase-h-telophase-reconstruction-of-one-of-the-d-image216168837.htmlRMPFK9FH–. Cytology, with special reference to the metazoan nucleus. Cells. i MITOSIS 7 somes, each of which subsequently divides into two daughter chromosomes. The original series of chromosomes is thereby duplicated into two exactly. Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus; B, very early prophase; C, D, middle prophase; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase (seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the d
The development of the human body; a manual of human embryology . * a,. tr * ? Fig. 245.—Section of the Scala Media of the Cochlea of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of scala media; M.t, membrana tec- toria; V.s.p, vein; 1 to 7, organ of Corti.—{Baginsky.) stance and form the rods of Corti, while the three outerrows (4 to 6) develop into the outer hair cells. It is inconnection with the hair cells that the peripheral pro-longations of the cells of the cochlear ganglion terminate,and since these hair cells are arranged in rows extendingthe entire length of the scala Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-a-tr-fig-245section-of-the-scala-media-of-the-cochlea-of-a-rabbit-embryo-of-55-mm-a-mesenchyme-b-to-e-epithelium-of-scala-media-mt-membrana-tec-toria-vsp-vein-1-to-7-organ-of-cortibaginsky-stance-and-form-the-rods-of-corti-while-the-three-outerrows-4-to-6-develop-into-the-outer-hair-cells-it-is-inconnection-with-the-hair-cells-that-the-peripheral-pro-longations-of-the-cells-of-the-cochlear-ganglion-terminateand-since-these-hair-cells-are-arranged-in-rows-extendingthe-entire-length-of-the-scala-image340304313.htmlRM2ANJ5HD–The development of the human body; a manual of human embryology . * a,. tr * ? Fig. 245.—Section of the Scala Media of the Cochlea of a Rabbit Embryo of 55 mm. a, Mesenchyme; b to e, epithelium of scala media; M.t, membrana tec- toria; V.s.p, vein; 1 to 7, organ of Corti.—{Baginsky.) stance and form the rods of Corti, while the three outerrows (4 to 6) develop into the outer hair cells. It is inconnection with the hair cells that the peripheral pro-longations of the cells of the cochlear ganglion terminate,and since these hair cells are arranged in rows extendingthe entire length of the scala
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there are five, viz.: (1) the mandibular in front of the first pouch, form- ing als Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-175-visceral-furrows-in-front-of-the-first-at-the-14-16-s-stage-these-he-in-terprets-as-phyletic-rudiments-it-is-certain-that-the-lower-vertebrates-had-pouches-posterior-to-the-fourth-the-post-branchial-bodies-see-p-309-are-probably-rudiments-of-a-fifth-pair-of-pouches-the-tissue-between-the-visceral-pouches-thickens-by-accumu-lation-of-mesenchyme-to-form-the-visceral-arches-of-which-there-are-five-viz-1-the-mandibular-in-front-of-the-first-pouch-form-ing-als-image215970230.htmlRMPFA86E–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 175 visceral furrows in front of the first at the 14-16 s stage. These he in- terprets as phyletic rudiments. It is certain that the lower vertebrates had pouches posterior to the fourth. The post-branchial bodies (see p. 309) are probably rudiments of a fifth pair of pouches. The tissue between the visceral pouches thickens, by accumu- lation of mesenchyme, to form the visceral arches, of which there are five, viz.: (1) the mandibular in front of the first pouch, form- ing als
The Journal of experimental zoology . 192 Edivin G. Conklin. mesenchyme derived from the cell A^*^. In the embryo shown in Fig.71 the neural plate cells are clearly shown around the periphery ofthe figure and two of the cells contain sense spots. The chorda,endoderm, and mesenchyme cells are shown internal to the neuralplate, but I am unable to distinguish in this embryo between thesethree kinds of cells; they are all more or less yolk-laden as in thenormal egg. Owing probably to the fact that no ventral ecto-derm cells are present the neural plate is not pushed up onto thedorsal face and ther Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-journal-of-experimental-zoology-192-edivin-g-conklin-mesenchyme-derived-from-the-cell-a-in-the-embryo-shown-in-fig71-the-neural-plate-cells-are-clearly-shown-around-the-periphery-ofthe-figure-and-two-of-the-cells-contain-sense-spots-the-chordaendoderm-and-mesenchyme-cells-are-shown-internal-to-the-neuralplate-but-i-am-unable-to-distinguish-in-this-embryo-between-thesethree-kinds-of-cells-they-are-all-more-or-less-yolk-laden-as-in-thenormal-egg-owing-probably-to-the-fact-that-no-ventral-ecto-derm-cells-are-present-the-neural-plate-is-not-pushed-up-onto-thedorsal-face-and-ther-image340242365.htmlRM2ANFAH1–The Journal of experimental zoology . 192 Edivin G. Conklin. mesenchyme derived from the cell A^*^. In the embryo shown in Fig.71 the neural plate cells are clearly shown around the periphery ofthe figure and two of the cells contain sense spots. The chorda,endoderm, and mesenchyme cells are shown internal to the neuralplate, but I am unable to distinguish in this embryo between thesethree kinds of cells; they are all more or less yolk-laden as in thenormal egg. Owing probably to the fact that no ventral ecto-derm cells are present the neural plate is not pushed up onto thedorsal face and ther
. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. 0 0 Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus ; B, very early prophase ; C, D, middle prophase ; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase {seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in transverse section and under a higher magnification.. Please note that these images are ex Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cytology-with-special-reference-to-the-metazoan-nucleus-cells-cytology-0-0-fig-3-mitosis-in-lepidosiren-mesenchyme-cell-a-resting-nucleus-b-very-early-prophase-c-d-middle-prophase-e-late-prophase-the-nuclear-membrane-has-disappeared-and-the-chromosomes-are-becoming-attached-to-the-spindle-fibres-f-metaphase-seen-from-above-only-about-half-of-the-chromosomes-are-shown-g-anaphase-h-telophase-reconstruction-of-one-of-the-daughter-nuclei-i-two-of-the-chromosomes-from-h-in-transverse-section-and-under-a-higher-magnification-please-note-that-these-images-are-ex-image216168265.htmlRMPFK8R5–. Cytology, with special reference to the metazoan nucleus. Cells; Cytology. 0 0 Fig. 3. Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus ; B, very early prophase ; C, D, middle prophase ; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase {seen from above). Only about half of the chromosomes are shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in transverse section and under a higher magnification.. Please note that these images are ex
Papers . ch a swimming stage in 532 hours after theinsemination of the egg; mesenchyme cells begin to push into the Hyhrklizalion of Echhwids. 7 blastocoele from the flattened and thickened posterior pole of theblastula in 8 hours; the process of gastrulation begins in 9 hours;chromatophores appear in 15 to 16 hours; skeletal spicules appear in15 to 16 hours; and the young pluteus stage is reach in 24 hours afterinsemination; it may be reached in as short a time as 20 hours.These facts are shown in parallel columns (p. 6). The hours mentionedindicate hours after insemination. The difference in Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/papers-ch-a-swimming-stage-in-532-hours-after-theinsemination-of-the-egg-mesenchyme-cells-begin-to-push-into-the-hyhrklizalion-of-echhwids-7-blastocoele-from-the-flattened-and-thickened-posterior-pole-of-theblastula-in-8-hours-the-process-of-gastrulation-begins-in-9-hourschromatophores-appear-in-15-to-16-hours-skeletal-spicules-appear-in15-to-16-hours-and-the-young-pluteus-stage-is-reach-in-24-hours-afterinsemination-it-may-be-reached-in-as-short-a-time-as-20-hoursthese-facts-are-shown-in-parallel-columns-p-6-the-hours-mentionedindicate-hours-after-insemination-the-difference-in-image342822405.htmlRM2AWMWD9–Papers . ch a swimming stage in 532 hours after theinsemination of the egg; mesenchyme cells begin to push into the Hyhrklizalion of Echhwids. 7 blastocoele from the flattened and thickened posterior pole of theblastula in 8 hours; the process of gastrulation begins in 9 hours;chromatophores appear in 15 to 16 hours; skeletal spicules appear in15 to 16 hours; and the young pluteus stage is reach in 24 hours afterinsemination; it may be reached in as short a time as 20 hours.These facts are shown in parallel columns (p. 6). The hours mentionedindicate hours after insemination. The difference in
. Cytology, with special reference to the metazoan nucleus. Cells. Fig. 3.. 0 0 Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus; B, very early prophase; C, D, middle prophase; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase (seen from above). Only about half of the chromosomes .ire shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in transverse section and under a higher magnification.. Please note that these images are extracted fro Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cytology-with-special-reference-to-the-metazoan-nucleus-cells-fig-3-0-0-mitosis-in-lepidosiren-mesenchyme-cell-a-resting-nucleus-b-very-early-prophase-c-d-middle-prophase-e-late-prophase-the-nuclear-membrane-has-disappeared-and-the-chromosomes-are-becoming-attached-to-the-spindle-fibres-f-metaphase-seen-from-above-only-about-half-of-the-chromosomes-ire-shown-g-anaphase-h-telophase-reconstruction-of-one-of-the-daughter-nuclei-i-two-of-the-chromosomes-from-h-in-transverse-section-and-under-a-higher-magnification-please-note-that-these-images-are-extracted-fro-image216168577.htmlRMPFK969–. Cytology, with special reference to the metazoan nucleus. Cells. Fig. 3.. 0 0 Mitosis in Lepidosiren (mesenchyme cell). A, resting nucleus; B, very early prophase; C, D, middle prophase; E, late prophase. The nuclear membrane has disappeared and the chromosomes are becoming attached to the spindle fibres. F, metaphase (seen from above). Only about half of the chromosomes .ire shown. G, anaphase ; H, telophase, reconstruction of one of the daughter nuclei; I, two of the chromosomes from H, in transverse section and under a higher magnification.. Please note that these images are extracted fro
The Journal of experimental zoology . l66 • Edwin G. Conkltn. Right or Left Half or Three-Quarter Embryos; Gastrula to Tadpole. Drawn fromFixed and Stained Material. Fig. 31. Right half gastrula of about 220-cell stage; spurted in the 4-cell stage and fixed 3 hourslater. The neural plate, chorda and mesoderm cells are present only on the right side and in theirnormal positions and numbers. Fig. 32. Left half of young tadpole, dorsal view; spurted in the 4-cell stage, fixed 5 hours later.The notochord is normal except for size and number of cells; the muscle and mesenchyme cellsare present only Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-journal-of-experimental-zoology-l66-edwin-g-conkltn-right-or-left-half-or-three-quarter-embryos-gastrula-to-tadpole-drawn-fromfixed-and-stained-material-fig-31-right-half-gastrula-of-about-220-cell-stage-spurted-in-the-4-cell-stage-and-fixed-3-hourslater-the-neural-plate-chorda-and-mesoderm-cells-are-present-only-on-the-right-side-and-in-theirnormal-positions-and-numbers-fig-32-left-half-of-young-tadpole-dorsal-view-spurted-in-the-4-cell-stage-fixed-5-hours-laterthe-notochord-is-normal-except-for-size-and-number-of-cells-the-muscle-and-mesenchyme-cellsare-present-only-image340258074.htmlRM2ANG2J2–The Journal of experimental zoology . l66 • Edwin G. Conkltn. Right or Left Half or Three-Quarter Embryos; Gastrula to Tadpole. Drawn fromFixed and Stained Material. Fig. 31. Right half gastrula of about 220-cell stage; spurted in the 4-cell stage and fixed 3 hourslater. The neural plate, chorda and mesoderm cells are present only on the right side and in theirnormal positions and numbers. Fig. 32. Left half of young tadpole, dorsal view; spurted in the 4-cell stage, fixed 5 hours later.The notochord is normal except for size and number of cells; the muscle and mesenchyme cellsare present only
![. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo](https://c8.alamy.com/comp/PFA885/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-PFA885.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-image215970277.htmlRMPFA885–. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc
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