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A text-book of dental histology and embryology, including laboratory directions . Embryo showing branchial arches and stomodeum. PLATE XIX Second aortic arch.Third aortic arch. Auditory vesicle, Primitivejugular vein.^ Fourth, aortic arch Fifth aortic-arch. Dorsal aorta. Cardinal vein. Mid-gut. Hind-gut. —. First aortic arch. ,-Olfactory pit. Maxillary process. Hyomandibular cleft. Mandibular arch. Aortic bulb. Auricle. Duct of Cuvier. Ventricle. Allantois.- Umbilical {allantoic artery). Umbilical Profile View of a Human Embryo Estimated at Twenty-oneDays Old. (After His.) Showing branchial ar Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-text-book-of-dental-histology-and-embryology-including-laboratory-directions-embryo-showing-branchial-arches-and-stomodeum-plate-xix-second-aortic-archthird-aortic-arch-auditory-vesicle-primitivejugular-vein-fourth-aortic-arch-fifth-aortic-arch-dorsal-aorta-cardinal-vein-mid-gut-hind-gut-first-aortic-arch-olfactory-pit-maxillary-process-hyomandibular-cleft-mandibular-arch-aortic-bulb-auricle-duct-of-cuvier-ventricle-allantois-umbilical-allantoic-artery-umbilical-profile-view-of-a-human-embryo-estimated-at-twenty-onedays-old-after-his-showing-branchial-ar-image338193722.htmlRM2AJ61F6–A text-book of dental histology and embryology, including laboratory directions . Embryo showing branchial arches and stomodeum. PLATE XIX Second aortic arch.Third aortic arch. Auditory vesicle, Primitivejugular vein.^ Fourth, aortic arch Fifth aortic-arch. Dorsal aorta. Cardinal vein. Mid-gut. Hind-gut. —. First aortic arch. ,-Olfactory pit. Maxillary process. Hyomandibular cleft. Mandibular arch. Aortic bulb. Auricle. Duct of Cuvier. Ventricle. Allantois.- Umbilical {allantoic artery). Umbilical Profile View of a Human Embryo Estimated at Twenty-oneDays Old. (After His.) Showing branchial ar
Embryological development of the face weeks 6-8 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryological-development-of-the-face-weeks-6-8-image455240947.htmlRF2HCJ0D7–Embryological development of the face weeks 6-8
. A manual of zoology. Zoology. Fig. 376. Fig. 377. Fig. sjG.—Apus equalis* (after Packard). Fig. 377.—Antennal gland of Mysis (after Grobben). external opening; /(, bladder; re, canal; 5, internal vesicle. Fig. 37S.—Otocyst of craylishi. as, crista acustica; n, nen'e. Fig. 373. blr, blood lacunre; ea. Concerning the internal organs-but few general remarks can be made. Salivary glands are wdiolly absent; on the other hand, the stomodeum is usually widened into a strong chewing 'stomach,' and behind this empty the ducts of the so-called liver. Tliis varies lietween the two simple blind sacs of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-376-fig-377-fig-sjgapus-equalis-after-packard-fig-377antennal-gland-of-mysis-after-grobben-external-opening-bladder-re-canal-5-internal-vesicle-fig-37sotocyst-of-craylishi-as-crista-acustica-n-nene-fig-373-blr-blood-lacunre-ea-concerning-the-internal-organs-but-few-general-remarks-can-be-made-salivary-glands-are-wdiolly-absent-on-the-other-hand-the-stomodeum-is-usually-widened-into-a-strong-chewing-stomach-and-behind-this-empty-the-ducts-of-the-so-called-liver-tliis-varies-lietween-the-two-simple-blind-sacs-of-image216446443.htmlRMPG3YJ3–. A manual of zoology. Zoology. Fig. 376. Fig. 377. Fig. sjG.—Apus equalis* (after Packard). Fig. 377.—Antennal gland of Mysis (after Grobben). external opening; /(, bladder; re, canal; 5, internal vesicle. Fig. 37S.—Otocyst of craylishi. as, crista acustica; n, nen'e. Fig. 373. blr, blood lacunre; ea. Concerning the internal organs-but few general remarks can be made. Salivary glands are wdiolly absent; on the other hand, the stomodeum is usually widened into a strong chewing 'stomach,' and behind this empty the ducts of the so-called liver. Tliis varies lietween the two simple blind sacs of
. The biology of the frog . contact with another structure, the pituitarybody, which is developed from the ectoderm of the dorsalwall of the stomodeum. The sides of the thalamencephalongive rise to a pair of lateral diverticula, the optic vesicles,which grow out until they come in close contact with thesurface ectoderm. The distal end of the vesicles widensout to form the retina of the eyes, the stalk giving rise tothe optic nerve. The anterior wall of the forebrain produces a pair ofpouches, the cerebral hemispheres, which finally becomethe largest part of the brain. Their cavities, the later Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biology-of-the-frog-contact-with-another-structure-the-pituitarybody-which-is-developed-from-the-ectoderm-of-the-dorsalwall-of-the-stomodeum-the-sides-of-the-thalamencephalongive-rise-to-a-pair-of-lateral-diverticula-the-optic-vesicleswhich-grow-out-until-they-come-in-close-contact-with-thesurface-ectoderm-the-distal-end-of-the-vesicles-widensout-to-form-the-retina-of-the-eyes-the-stalk-giving-rise-tothe-optic-nerve-the-anterior-wall-of-the-forebrain-produces-a-pair-ofpouches-the-cerebral-hemispheres-which-finally-becomethe-largest-part-of-the-brain-their-cavities-the-later-image372364450.htmlRM2CHPJJA–. The biology of the frog . contact with another structure, the pituitarybody, which is developed from the ectoderm of the dorsalwall of the stomodeum. The sides of the thalamencephalongive rise to a pair of lateral diverticula, the optic vesicles,which grow out until they come in close contact with thesurface ectoderm. The distal end of the vesicles widensout to form the retina of the eyes, the stalk giving rise tothe optic nerve. The anterior wall of the forebrain produces a pair ofpouches, the cerebral hemispheres, which finally becomethe largest part of the brain. Their cavities, the later
. A manual of zoology. Zoology. Fig. 283. Fig. 2S4. Fig. 283.—Three stages in the development of the coelom and water-vascular system (after Bury and McBride). a, ampulla; b, stone canal; c', c'-, left and right ccelom sacs; d, hind gut with anus; h h'-, left and right (rudimentary) hydrocoele sac; he, common anlage of hydrocccle and co^loni; m, stomach; 5, stomodeum and mouth. Fig. 284.—Formation of Ophiuran from the pluteus larva (after MuUer, from Korshelt-Heider). Class I. Asteroidea (Starfish). Two parts can be recognized in the body of a starfish, a central disc and the arms, usually fi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-283-fig-2s4-fig-283three-stages-in-the-development-of-the-coelom-and-water-vascular-system-after-bury-and-mcbride-a-ampulla-b-stone-canal-c-c-left-and-right-ccelom-sacs-d-hind-gut-with-anus-h-h-left-and-right-rudimentary-hydrocoele-sac-he-common-anlage-of-hydrocccle-and-coloni-m-stomach-5-stomodeum-and-mouth-fig-284formation-of-ophiuran-from-the-pluteus-larva-after-muuer-from-korshelt-heider-class-i-asteroidea-starfish-two-parts-can-be-recognized-in-the-body-of-a-starfish-a-central-disc-and-the-arms-usually-fi-image216376871.htmlRMPG0PWB–. A manual of zoology. Zoology. Fig. 283. Fig. 2S4. Fig. 283.—Three stages in the development of the coelom and water-vascular system (after Bury and McBride). a, ampulla; b, stone canal; c', c'-, left and right ccelom sacs; d, hind gut with anus; h h'-, left and right (rudimentary) hydrocoele sac; he, common anlage of hydrocccle and co^loni; m, stomach; 5, stomodeum and mouth. Fig. 284.—Formation of Ophiuran from the pluteus larva (after MuUer, from Korshelt-Heider). Class I. Asteroidea (Starfish). Two parts can be recognized in the body of a starfish, a central disc and the arms, usually fi
. Chordate morphology. Morphology (Animals); Chordata. nasal pouch Rathke's pouch stomodeum pituitary. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-morphology-morphology-animals-chordata-nasal-pouch-rathkes-pouch-stomodeum-pituitary-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-jollie-malcolm-new-york-reinhold-image234949519.htmlRMRJ6TE7–. Chordate morphology. Morphology (Animals); Chordata. nasal pouch Rathke's pouch stomodeum pituitary. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold
. Chordate morphology. Morphology (Animals); Chordata. nasal pouch Rathke's pouch stomodeum pituitary. B otic vesicle. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-morphology-morphology-animals-chordata-nasal-pouch-rathkes-pouch-stomodeum-pituitary-b-otic-vesicle-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-jollie-malcolm-new-york-reinhold-image234949505.htmlRMRJ6TDN–. Chordate morphology. Morphology (Animals); Chordata. nasal pouch Rathke's pouch stomodeum pituitary. B otic vesicle. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold
. Chordate morphology. Morphology (Animals); Chordata. entoderi mesoderm mesoderm w^q,. diverticulum. optic vesicle stomodeum solid Rathke's pouch oral sucker hind brain mesenchyme subchordal rod neurenteric canal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-morphology-morphology-animals-chordata-entoderi-mesoderm-mesoderm-wq-diverticulum-optic-vesicle-stomodeum-solid-rathkes-pouch-oral-sucker-hind-brain-mesenchyme-subchordal-rod-neurenteric-canal-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-jollie-malcolm-new-york-reinhold-image234907159.htmlRMRJ4XDB–. Chordate morphology. Morphology (Animals); Chordata. entoderi mesoderm mesoderm w^q,. diverticulum. optic vesicle stomodeum solid Rathke's pouch oral sucker hind brain mesenchyme subchordal rod neurenteric canal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 206 COMPARATIVE MORPHOLOGY OF VERTEBRATES. In the majority of vertebrates the blastopore closes behind, so that the anus is a new formation, although it arises in the line of closure. In the amniotes this opening is preceded by the formation of a pocket, the proctodeum, similar to the stomodeum, and opening later into the mesenteron in the same way. In the adult it is impossible to find any lines separating the three regions, stomodeum, mesenteron and proctodeum. The proctodeum lies wholly behind the entrance o Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-of-vertebrates-anatomy-comparative-vertebrates-anatomy-206-comparative-morphology-of-vertebrates-in-the-majority-of-vertebrates-the-blastopore-closes-behind-so-that-the-anus-is-a-new-formation-although-it-arises-in-the-line-of-closure-in-the-amniotes-this-opening-is-preceded-by-the-formation-of-a-pocket-the-proctodeum-similar-to-the-stomodeum-and-opening-later-into-the-mesenteron-in-the-same-way-in-the-adult-it-is-impossible-to-find-any-lines-separating-the-three-regions-stomodeum-mesenteron-and-proctodeum-the-proctodeum-lies-wholly-behind-the-entrance-o-image232667413.htmlRMREEWJD–. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 206 COMPARATIVE MORPHOLOGY OF VERTEBRATES. In the majority of vertebrates the blastopore closes behind, so that the anus is a new formation, although it arises in the line of closure. In the amniotes this opening is preceded by the formation of a pocket, the proctodeum, similar to the stomodeum, and opening later into the mesenteron in the same way. In the adult it is impossible to find any lines separating the three regions, stomodeum, mesenteron and proctodeum. The proctodeum lies wholly behind the entrance o
. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 205 by the hard and soft palates, which separate the mouth cavity from the narial passage above. Development of the Mouth At a relatively late stage of ontogenesis, at the anterior end of the fore-gut where the mouth is to break through, the ectoderm invaginates to form the stomodeum, the depth of which, in amniotes, is considerably increased by the expansion of the fore-brain in front and the heart behind. At the bottom of the stomodeum, ectoderm and endoderm are in contact as a two-layered membrane, which ruptures and disappea Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-the-digestive-system-205-by-the-hard-and-soft-palates-which-separate-the-mouth-cavity-from-the-narial-passage-above-development-of-the-mouth-at-a-relatively-late-stage-of-ontogenesis-at-the-anterior-end-of-the-fore-gut-where-the-mouth-is-to-break-through-the-ectoderm-invaginates-to-form-the-stomodeum-the-depth-of-which-in-amniotes-is-considerably-increased-by-the-expansion-of-the-fore-brain-in-front-and-the-heart-behind-at-the-bottom-of-the-stomodeum-ectoderm-and-endoderm-are-in-contact-as-a-two-layered-membrane-which-ruptures-and-disappea-image232676972.htmlRMREF9RT–. Comparative anatomy. Anatomy, Comparative. THE DIGESTIVE SYSTEM 205 by the hard and soft palates, which separate the mouth cavity from the narial passage above. Development of the Mouth At a relatively late stage of ontogenesis, at the anterior end of the fore-gut where the mouth is to break through, the ectoderm invaginates to form the stomodeum, the depth of which, in amniotes, is considerably increased by the expansion of the fore-brain in front and the heart behind. At the bottom of the stomodeum, ectoderm and endoderm are in contact as a two-layered membrane, which ruptures and disappea
. Comparative anatomy. Anatomy, Comparative. 636 COMPARATIVE ANATOMY nation which forms the mouth in annelids to the ectodermal hypophysis in cyclostomes. Minot's hypothesis involves three assumptions: 1. The preservation of the ectodermal stomodeum of annelids as the naso-hypophysial invagination of vertebrates. 2. The formation of the vertebrate brain from several of the post- oral ganglia of the ventral chain. 3. The conversion of the visual apparatus and supra-esophageal ganglia, which are prevented from fusing in the median line by the enlargement of the vertebrate brain, into the vertebr Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-636-comparative-anatomy-nation-which-forms-the-mouth-in-annelids-to-the-ectodermal-hypophysis-in-cyclostomes-minots-hypothesis-involves-three-assumptions-1-the-preservation-of-the-ectodermal-stomodeum-of-annelids-as-the-naso-hypophysial-invagination-of-vertebrates-2-the-formation-of-the-vertebrate-brain-from-several-of-the-post-oral-ganglia-of-the-ventral-chain-3-the-conversion-of-the-visual-apparatus-and-supra-esophageal-ganglia-which-are-prevented-from-fusing-in-the-median-line-by-the-enlargement-of-the-vertebrate-brain-into-the-vertebr-image232674321.htmlRMREF6D5–. Comparative anatomy. Anatomy, Comparative. 636 COMPARATIVE ANATOMY nation which forms the mouth in annelids to the ectodermal hypophysis in cyclostomes. Minot's hypothesis involves three assumptions: 1. The preservation of the ectodermal stomodeum of annelids as the naso-hypophysial invagination of vertebrates. 2. The formation of the vertebrate brain from several of the post- oral ganglia of the ventral chain. 3. The conversion of the visual apparatus and supra-esophageal ganglia, which are prevented from fusing in the median line by the enlargement of the vertebrate brain, into the vertebr
. Chordate anatomy. Chordata; Anatomy, Comparative. 2l8 CHORDATE ANATOMY by the hard and soft palates, which separate the mouth cavity from the nasal passage above. Development. At a relatively late state of ontogenesis, at the anterior end of the fore-gut where the mouth is to break through, the ectoderm invaginates to form the stomodeum. At the bottom of the stomodeum, ectoderm and endoderm are in contact as a two-layered membrane, which ruptures and disappears leaving no trace in the adult. The covering of the lips and gums is derived from the ectodermal stomodeum, while that of the rest of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-anatomy-chordata-anatomy-comparative-2l8-chordate-anatomy-by-the-hard-and-soft-palates-which-separate-the-mouth-cavity-from-the-nasal-passage-above-development-at-a-relatively-late-state-of-ontogenesis-at-the-anterior-end-of-the-fore-gut-where-the-mouth-is-to-break-through-the-ectoderm-invaginates-to-form-the-stomodeum-at-the-bottom-of-the-stomodeum-ectoderm-and-endoderm-are-in-contact-as-a-two-layered-membrane-which-ruptures-and-disappears-leaving-no-trace-in-the-adult-the-covering-of-the-lips-and-gums-is-derived-from-the-ectodermal-stomodeum-while-that-of-the-rest-of-image234909222.htmlRMRJ5132–. Chordate anatomy. Chordata; Anatomy, Comparative. 2l8 CHORDATE ANATOMY by the hard and soft palates, which separate the mouth cavity from the nasal passage above. Development. At a relatively late state of ontogenesis, at the anterior end of the fore-gut where the mouth is to break through, the ectoderm invaginates to form the stomodeum. At the bottom of the stomodeum, ectoderm and endoderm are in contact as a two-layered membrane, which ruptures and disappears leaving no trace in the adult. The covering of the lips and gums is derived from the ectodermal stomodeum, while that of the rest of
. Coral and atolls: a history and description of the Keeling-Cocos Islands, with an account of their fauna and flora, and a discussion of the method of development and transformation of coral structures in general. Coral reefs and islands. EARLY LIFE-HISTORY OF CORALS 67 These symbiotic algse are crowded most densely about the region of the month, which is in consequence more deeply coloured, but, strangely enough, after the larvte have lived their independent existence for some time, and have become possessed of a definite stomodeum and internal cavity, these Fig. 10.. A Section through a Com Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/coral-and-atolls-a-history-and-description-of-the-keeling-cocos-islands-with-an-account-of-their-fauna-and-flora-and-a-discussion-of-the-method-of-development-and-transformation-of-coral-structures-in-general-coral-reefs-and-islands-early-life-history-of-corals-67-these-symbiotic-algse-are-crowded-most-densely-about-the-region-of-the-month-which-is-in-consequence-more-deeply-coloured-but-strangely-enough-after-the-larvte-have-lived-their-independent-existence-for-some-time-and-have-become-possessed-of-a-definite-stomodeum-and-internal-cavity-these-fig-10-a-section-through-a-com-image232524065.htmlRMRE8APW–. Coral and atolls: a history and description of the Keeling-Cocos Islands, with an account of their fauna and flora, and a discussion of the method of development and transformation of coral structures in general. Coral reefs and islands. EARLY LIFE-HISTORY OF CORALS 67 These symbiotic algse are crowded most densely about the region of the month, which is in consequence more deeply coloured, but, strangely enough, after the larvte have lived their independent existence for some time, and have become possessed of a definite stomodeum and internal cavity, these Fig. 10.. A Section through a Com
. Comparative anatomy. Anatomy, Comparative. PROTONEPHRIOIUM- MESODERM Fig. 522.—A diagram of a trochophore larva. According to Delsman's theory of the origin of vertebrates, the cardiopore (blastopore) of the trochophore larva is homolo- gous with the neurenteric canal of vertebrates. In other words the relatively short stomodeum of the annelid is stretched to become the neural tube of vertebrates. (Redrawn after Hatschek.) he claims, processes which occur in early development serve to explain why the neural tube does not elongate in this fashion. The backward growth of the blastopore in vert Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-protonephrioium-mesoderm-fig-522a-diagram-of-a-trochophore-larva-according-to-delsmans-theory-of-the-origin-of-vertebrates-the-cardiopore-blastopore-of-the-trochophore-larva-is-homolo-gous-with-the-neurenteric-canal-of-vertebrates-in-other-words-the-relatively-short-stomodeum-of-the-annelid-is-stretched-to-become-the-neural-tube-of-vertebrates-redrawn-after-hatschek-he-claims-processes-which-occur-in-early-development-serve-to-explain-why-the-neural-tube-does-not-elongate-in-this-fashion-the-backward-growth-of-the-blastopore-in-vert-image232674313.htmlRMREF6CW–. Comparative anatomy. Anatomy, Comparative. PROTONEPHRIOIUM- MESODERM Fig. 522.—A diagram of a trochophore larva. According to Delsman's theory of the origin of vertebrates, the cardiopore (blastopore) of the trochophore larva is homolo- gous with the neurenteric canal of vertebrates. In other words the relatively short stomodeum of the annelid is stretched to become the neural tube of vertebrates. (Redrawn after Hatschek.) he claims, processes which occur in early development serve to explain why the neural tube does not elongate in this fashion. The backward growth of the blastopore in vert
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 491 hibits a well marked optic vesicle while the nerve system shows clearly the three primary brain vesicles and the beginning development of hemicerebra. The stomodeum is marked and two branchial arches are present, the first arch has already divided into maxillary and mandibular portions. The study of the left embryo is more difficult, as it does not present a profile view. 3. The monster represents about seventy two hours incubation. It exhibits a double caudal extremity, each of which is composed of nine somites. The rema Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomischer-anzeiger-anatomy-comparative-anatomy-comparative-491-hibits-a-well-marked-optic-vesicle-while-the-nerve-system-shows-clearly-the-three-primary-brain-vesicles-and-the-beginning-development-of-hemicerebra-the-stomodeum-is-marked-and-two-branchial-arches-are-present-the-first-arch-has-already-divided-into-maxillary-and-mandibular-portions-the-study-of-the-left-embryo-is-more-difficult-as-it-does-not-present-a-profile-view-3-the-monster-represents-about-seventy-two-hours-incubation-it-exhibits-a-double-caudal-extremity-each-of-which-is-composed-of-nine-somites-the-rema-image236806823.htmlRMRN7DEF–. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 491 hibits a well marked optic vesicle while the nerve system shows clearly the three primary brain vesicles and the beginning development of hemicerebra. The stomodeum is marked and two branchial arches are present, the first arch has already divided into maxillary and mandibular portions. The study of the left embryo is more difficult, as it does not present a profile view. 3. The monster represents about seventy two hours incubation. It exhibits a double caudal extremity, each of which is composed of nine somites. The rema
. Animal biology. Zoology; Biology. CLASS AMPHIBIA 379 tion called the stomodeum marks the beginning of the mouth, while toward the posterior end of the body, below the tail, which is developing backward, is formed another invagination, the proctodeum, which will become the cloacal opening. The medullary groove is converted into a medullary tube by the meeting of the ridges on each side of it. This tube in turn develops into the central nervous system. Eyes appear on each side of the head, and external gills are formed which project outward from the branchial arches. At the same time muscle se Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/animal-biology-zoology-biology-class-amphibia-379-tion-called-the-stomodeum-marks-the-beginning-of-the-mouth-while-toward-the-posterior-end-of-the-body-below-the-tail-which-is-developing-backward-is-formed-another-invagination-the-proctodeum-which-will-become-the-cloacal-opening-the-medullary-groove-is-converted-into-a-medullary-tube-by-the-meeting-of-the-ridges-on-each-side-of-it-this-tube-in-turn-develops-into-the-central-nervous-system-eyes-appear-on-each-side-of-the-head-and-external-gills-are-formed-which-project-outward-from-the-branchial-arches-at-the-same-time-muscle-se-image236763424.htmlRMRN5E4G–. Animal biology. Zoology; Biology. CLASS AMPHIBIA 379 tion called the stomodeum marks the beginning of the mouth, while toward the posterior end of the body, below the tail, which is developing backward, is formed another invagination, the proctodeum, which will become the cloacal opening. The medullary groove is converted into a medullary tube by the meeting of the ridges on each side of it. This tube in turn develops into the central nervous system. Eyes appear on each side of the head, and external gills are formed which project outward from the branchial arches. At the same time muscle se
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 324 S. Q. IRVINE ET AL cells. Also visible are light-emitting photocytes ventrolat- eral to the intestine; these, described by Henry (1989). are functional by stage L2. Staining with alcian blue (not shown) reveals large mucosal cells dorsal and lateral to the stomodeum. Late period, ll-30das. This period is morphologically similar to the preceding, the most obvious difference being the addition of a pair of dorsomedial eyes. The stomach becomes still larger relative to the overall body, and the mesotroch widens with it. Th Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-324-s-q-irvine-et-al-cells-also-visible-are-light-emitting-photocytes-ventrolat-eral-to-the-intestine-these-described-by-henry-1989-are-functional-by-stage-l2-staining-with-alcian-blue-not-shown-reveals-large-mucosal-cells-dorsal-and-lateral-to-the-stomodeum-late-period-ll-30das-this-period-is-morphologically-similar-to-the-preceding-the-most-obvious-difference-being-the-addition-of-a-pair-of-dorsomedial-eyes-the-stomach-becomes-still-larger-relative-to-the-overall-body-and-the-mesotroch-widens-with-it-th-image234630408.htmlRMRHM9DC–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 324 S. Q. IRVINE ET AL cells. Also visible are light-emitting photocytes ventrolat- eral to the intestine; these, described by Henry (1989). are functional by stage L2. Staining with alcian blue (not shown) reveals large mucosal cells dorsal and lateral to the stomodeum. Late period, ll-30das. This period is morphologically similar to the preceding, the most obvious difference being the addition of a pair of dorsomedial eyes. The stomach becomes still larger relative to the overall body, and the mesotroch widens with it. Th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 LEWIS R. GARY. teries arise at a level below the lower end of the stomodeum. Either of these conclusions is at variance with the results which I have obtained in the study of the four species of actinians on which the present paper is based. Carlgren's figures and the statements directly relating to them are as follows: Ein querschnitt in der Schlundrohrsregion (Fig. 4, Taf. IX.) zeigt ein biradial Anordnung der vollstandigen Mesenterien mit den beiden Enden des spaltformigen Schlundrohrs sind zwei Richtungsmesenterienpaa Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-92-lewis-r-gary-teries-arise-at-a-level-below-the-lower-end-of-the-stomodeum-either-of-these-conclusions-is-at-variance-with-the-results-which-i-have-obtained-in-the-study-of-the-four-species-of-actinians-on-which-the-present-paper-is-based-carlgrens-figures-and-the-statements-directly-relating-to-them-are-as-follows-ein-querschnitt-in-der-schlundrohrsregion-fig-4-taf-ix-zeigt-ein-biradial-anordnung-der-vollstandigen-mesenterien-mit-den-beiden-enden-des-spaltformigen-schlundrohrs-sind-zwei-richtungsmesenterienpaa-image234704339.htmlRMRHRKNR–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 LEWIS R. GARY. teries arise at a level below the lower end of the stomodeum. Either of these conclusions is at variance with the results which I have obtained in the study of the four species of actinians on which the present paper is based. Carlgren's figures and the statements directly relating to them are as follows: Ein querschnitt in der Schlundrohrsregion (Fig. 4, Taf. IX.) zeigt ein biradial Anordnung der vollstandigen Mesenterien mit den beiden Enden des spaltformigen Schlundrohrs sind zwei Richtungsmesenterienpaa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 11. of the host (Fig. 3). The graft always became oriented in a regular manner after its canals joined those of the host regardless of its previous orientation. Later the graft joined the stomodeum of the host (Fig. 3). 9. A small portion of the mid-region of the stomodeum of an animal was grafted to the surface of another animal between its adtentacular rows. Very soon after the healing was complete the stomodeum of the host curved out toward the graft. This bending out toward the graft took place before there was any mecha Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-11-of-the-host-fig-3-the-graft-always-became-oriented-in-a-regular-manner-after-its-canals-joined-those-of-the-host-regardless-of-its-previous-orientation-later-the-graft-joined-the-stomodeum-of-the-host-fig-3-9-a-small-portion-of-the-mid-region-of-the-stomodeum-of-an-animal-was-grafted-to-the-surface-of-another-animal-between-its-adtentacular-rows-very-soon-after-the-healing-was-complete-the-stomodeum-of-the-host-curved-out-toward-the-graft-this-bending-out-toward-the-graft-took-place-before-there-was-any-mecha-image234674042.htmlRMRHP93P–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 11. of the host (Fig. 3). The graft always became oriented in a regular manner after its canals joined those of the host regardless of its previous orientation. Later the graft joined the stomodeum of the host (Fig. 3). 9. A small portion of the mid-region of the stomodeum of an animal was grafted to the surface of another animal between its adtentacular rows. Very soon after the healing was complete the stomodeum of the host curved out toward the graft. This bending out toward the graft took place before there was any mecha
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT IN AN OPHIUROID 383. Figure 3. Serial scmithin sections through a 28-h-old larva of Ophioneries xchayeri. Sections are oriented with the annual, or anterior, end towards the top of the figure, and vegetal, or posterior, end towards the bottom, (a) The stomodeum opens on the ventral surface, (b) The larval digestive tract is bipartite, consisting of an esophagus that is separated from the stomach by what appears to be an esophageal sphincter (arrow), (c) The gut is transiently open posteriorly i™ the blasto Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-larval-development-in-an-ophiuroid-383-figure-3-serial-scmithin-sections-through-a-28-h-old-larva-of-ophioneries-xchayeri-sections-are-oriented-with-the-annual-or-anterior-end-towards-the-top-of-the-figure-and-vegetal-or-posterior-end-towards-the-bottom-a-the-stomodeum-opens-on-the-ventral-surface-b-the-larval-digestive-tract-is-bipartite-consisting-of-an-esophagus-that-is-separated-from-the-stomach-by-what-appears-to-be-an-esophageal-sphincter-arrow-c-the-gut-is-transiently-open-posteriorly-i-the-blasto-image234616938.htmlRMRHKM8A–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL DEVELOPMENT IN AN OPHIUROID 383. Figure 3. Serial scmithin sections through a 28-h-old larva of Ophioneries xchayeri. Sections are oriented with the annual, or anterior, end towards the top of the figure, and vegetal, or posterior, end towards the bottom, (a) The stomodeum opens on the ventral surface, (b) The larval digestive tract is bipartite, consisting of an esophagus that is separated from the stomach by what appears to be an esophageal sphincter (arrow), (c) The gut is transiently open posteriorly i™ the blasto
. The Biological bulletin. Biology; Zoology; Marine biology. PHYSIOLOGICAL GRADIENT IN MNEMIOPSIS 199 apical organ; level 2 is mid-way between the apical organ and the bases of the auricles; and level 3 is near the bases of the auricles. Usually these grafts established connections with certain canals of the host as described by Coonfield (1937b). In these the order of connections was with the adtentacular, the tentacular, the paragastric canals, and with the stomodeum (Fig. 2, A). In some, however, this order in connecting. Fig. 1. This is a diagram of Mnemiopsis showing levels A, B, C, and D Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-marine-biology-physiological-gradient-in-mnemiopsis-199-apical-organ-level-2-is-mid-way-between-the-apical-organ-and-the-bases-of-the-auricles-and-level-3-is-near-the-bases-of-the-auricles-usually-these-grafts-established-connections-with-certain-canals-of-the-host-as-described-by-coonfield-1937b-in-these-the-order-of-connections-was-with-the-adtentacular-the-tentacular-the-paragastric-canals-and-with-the-stomodeum-fig-2-a-in-some-however-this-order-in-connecting-fig-1-this-is-a-diagram-of-mnemiopsis-showing-levels-a-b-c-and-d-image234629204.htmlRMRHM7XC–. The Biological bulletin. Biology; Zoology; Marine biology. PHYSIOLOGICAL GRADIENT IN MNEMIOPSIS 199 apical organ; level 2 is mid-way between the apical organ and the bases of the auricles; and level 3 is near the bases of the auricles. Usually these grafts established connections with certain canals of the host as described by Coonfield (1937b). In these the order of connections was with the adtentacular, the tentacular, the paragastric canals, and with the stomodeum (Fig. 2, A). In some, however, this order in connecting. Fig. 1. This is a diagram of Mnemiopsis showing levels A, B, C, and D
. Anatomy, descriptive and applied. Anatomy. PARTS DERIVED FROM THE FORE-BRAIN 909 The pituitary body or hypophysis^ is a structure of twofold origin, giving rise to a division into a prehypophysis and a posthjrpophysis. Tlie po.sthypophysis alone is of neural origin, developing as a ventral diverticulum from the primitive neural tube. The prehypophysis or epithelial lobe, develops from the stomodeum, or buccal cavity, as a tubular diverticulum (Rathke's), which eventually loses its connection^ with the oral tissues to become included within the cranial cavity and intimately attached to the ne Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomy-descriptive-and-applied-anatomy-parts-derived-from-the-fore-brain-909-the-pituitary-body-or-hypophysis-is-a-structure-of-twofold-origin-giving-rise-to-a-division-into-a-prehypophysis-and-a-posthjrpophysis-tlie-posthypophysis-alone-is-of-neural-origin-developing-as-a-ventral-diverticulum-from-the-primitive-neural-tube-the-prehypophysis-or-epithelial-lobe-develops-from-the-stomodeum-or-buccal-cavity-as-a-tubular-diverticulum-rathkes-which-eventually-loses-its-connection-with-the-oral-tissues-to-become-included-within-the-cranial-cavity-and-intimately-attached-to-the-ne-image236771701.htmlRMRN5TM5–. Anatomy, descriptive and applied. Anatomy. PARTS DERIVED FROM THE FORE-BRAIN 909 The pituitary body or hypophysis^ is a structure of twofold origin, giving rise to a division into a prehypophysis and a posthjrpophysis. Tlie po.sthypophysis alone is of neural origin, developing as a ventral diverticulum from the primitive neural tube. The prehypophysis or epithelial lobe, develops from the stomodeum, or buccal cavity, as a tubular diverticulum (Rathke's), which eventually loses its connection^ with the oral tissues to become included within the cranial cavity and intimately attached to the ne
. The biology of the frog. Frogs. io6 THE BIOLOGY OF THE FROG CHAP. The lining of the mouth cavity is formed from an invagin- ation of ectoderm, the stomodeum, which pushes in until it breaks through into the archenteron. A similar ectodermal invagination, the p7-ociodeum, forms the lining of a small part of the posterior end of the alimentary canal. The lens and. Fig. 26. — Cross section of a frog embryo. AR, archenteron; MS, meso- blastic somites; A^, notochord ; A^.V, neural crest; 71/, medullary tube ; PR, pronephros ; SN, snbnotochordal rod ; SO, SP, somatic and splanch- nic mesoderm. (Fr Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biology-of-the-frog-frogs-io6-the-biology-of-the-frog-chap-the-lining-of-the-mouth-cavity-is-formed-from-an-invagin-ation-of-ectoderm-the-stomodeum-which-pushes-in-until-it-breaks-through-into-the-archenteron-a-similar-ectodermal-invagination-the-p7-ociodeum-forms-the-lining-of-a-small-part-of-the-posterior-end-of-the-alimentary-canal-the-lens-and-fig-26-cross-section-of-a-frog-embryo-ar-archenteron-ms-meso-blastic-somites-a-notochord-av-neural-crest-71-medullary-tube-pr-pronephros-sn-snbnotochordal-rod-so-sp-somatic-and-splanch-nic-mesoderm-fr-image238490738.htmlRMRT05AA–. The biology of the frog. Frogs. io6 THE BIOLOGY OF THE FROG CHAP. The lining of the mouth cavity is formed from an invagin- ation of ectoderm, the stomodeum, which pushes in until it breaks through into the archenteron. A similar ectodermal invagination, the p7-ociodeum, forms the lining of a small part of the posterior end of the alimentary canal. The lens and. Fig. 26. — Cross section of a frog embryo. AR, archenteron; MS, meso- blastic somites; A^, notochord ; A^.V, neural crest; 71/, medullary tube ; PR, pronephros ; SN, snbnotochordal rod ; SO, SP, somatic and splanch- nic mesoderm. (Fr
. Chordate morphology. Morphology (Animals); Chordata. antoic diverticulum B BEGINNING OF SOMITE FORMATION notochord foregut serosa-^' Seesel's pocket anterior neuropore. posterior neuropore Hensen's node amniotic cavity hind brain. midbrain. Rathke's pouch forebroin stomodeum amniotic cavity blood vessel D 25-SOMITE STAGE Figure 9-6. Development of the gut (and ommion) in the early stages of the pig. (After Patten, 1 958) 258 • THE VISCERA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-morphology-morphology-animals-chordata-antoic-diverticulum-b-beginning-of-somite-formation-notochord-foregut-serosa-seesels-pocket-anterior-neuropore-posterior-neuropore-hensens-node-amniotic-cavity-hind-brain-midbrain-rathkes-pouch-forebroin-stomodeum-amniotic-cavity-blood-vessel-d-25-somite-stage-figure-9-6-development-of-the-gut-and-ommion-in-the-early-stages-of-the-pig-after-patten-1-958-258-the-viscera-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-image234951062.htmlRMRJ6XDA–. Chordate morphology. Morphology (Animals); Chordata. antoic diverticulum B BEGINNING OF SOMITE FORMATION notochord foregut serosa-^' Seesel's pocket anterior neuropore. posterior neuropore Hensen's node amniotic cavity hind brain. midbrain. Rathke's pouch forebroin stomodeum amniotic cavity blood vessel D 25-SOMITE STAGE Figure 9-6. Development of the gut (and ommion) in the early stages of the pig. (After Patten, 1 958) 258 • THE VISCERA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
. Senescence and rejuvenescence. Age; Reproduction. 326 SENESCENCE AND REJUVENESCENCE The diminished cell 5i of the two-cell stage produces a definite part of the ectoderm, and the cells 52, ^3, and 54 of following generations each have a definite fate. In other words, various portions of the soma or body are segregated before the so-called germ plasm.. Mesoderm I and Stomodeum Primitive germ cells Mesoderm II Fig. 142.—Diagram of the cell lineage in the early cleavage of Ascaris megalo- cephala: the black circles represent cells before chromatin diminution and the primitive germ cells which d Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/senescence-and-rejuvenescence-age-reproduction-326-senescence-and-rejuvenescence-the-diminished-cell-5i-of-the-two-cell-stage-produces-a-definite-part-of-the-ectoderm-and-the-cells-52-3-and-54-of-following-generations-each-have-a-definite-fate-in-other-words-various-portions-of-the-soma-or-body-are-segregated-before-the-so-called-germ-plasm-mesoderm-i-and-stomodeum-primitive-germ-cells-mesoderm-ii-fig-142diagram-of-the-cell-lineage-in-the-early-cleavage-of-ascaris-megalo-cephala-the-black-circles-represent-cells-before-chromatin-diminution-and-the-primitive-germ-cells-which-d-image232349428.htmlRMRE0C1T–. Senescence and rejuvenescence. Age; Reproduction. 326 SENESCENCE AND REJUVENESCENCE The diminished cell 5i of the two-cell stage produces a definite part of the ectoderm, and the cells 52, ^3, and 54 of following generations each have a definite fate. In other words, various portions of the soma or body are segregated before the so-called germ plasm.. Mesoderm I and Stomodeum Primitive germ cells Mesoderm II Fig. 142.—Diagram of the cell lineage in the early cleavage of Ascaris megalo- cephala: the black circles represent cells before chromatin diminution and the primitive germ cells which d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Left Side View Stomodeum Right Side View. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-left-side-view-stomodeum-right-side-view-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-marine-biological-laboratory-woods-hole-mass-marine-biological-laboratory-woods-hole-mass-annual-report-190708-1952-lillie-frank-rattray-1870-1947-moore-carl-richard-1892-redfield-alfred-clarence-1890-1983-woods-hole-mass-marine-biological-image234634351.htmlRMRHMEE7–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Left Side View Stomodeum Right Side View. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHAETOPTERUS LARVAL ONTOGENY 323 Ocelli: 2; one lateral pair Reference*: Henry (1986) fig. 3b-c; Bonch-Bruevich and Malakhov (1987) fig. 1 By this stage gastrulation is complete, forming a tripartite gut. A ventrally opening ciliated stomodeum is visible an- teriorly. The more medial stomach occupies about half the volume of the larva, and a much smaller intestine is located just anterior to the pygidium. The anus opens dorsally. The gut is functional at this time, as evidenced by algal particles in the stomach. A pair of st Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-chaetopterus-larval-ontogeny-323-ocelli-2-one-lateral-pair-reference-henry-1986-fig-3b-c-bonch-bruevich-and-malakhov-1987-fig-1-by-this-stage-gastrulation-is-complete-forming-a-tripartite-gut-a-ventrally-opening-ciliated-stomodeum-is-visible-an-teriorly-the-more-medial-stomach-occupies-about-half-the-volume-of-the-larva-and-a-much-smaller-intestine-is-located-just-anterior-to-the-pygidium-the-anus-opens-dorsally-the-gut-is-functional-at-this-time-as-evidenced-by-algal-particles-in-the-stomach-a-pair-of-st-image234630458.htmlRMRHM9F6–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHAETOPTERUS LARVAL ONTOGENY 323 Ocelli: 2; one lateral pair Reference*: Henry (1986) fig. 3b-c; Bonch-Bruevich and Malakhov (1987) fig. 1 By this stage gastrulation is complete, forming a tripartite gut. A ventrally opening ciliated stomodeum is visible an- teriorly. The more medial stomach occupies about half the volume of the larva, and a much smaller intestine is located just anterior to the pygidium. The anus opens dorsally. The gut is functional at this time, as evidenced by algal particles in the stomach. A pair of st
![. The chordates. Chordata. Reproduction 275 Ectoderm Notochord. Neurenteric canal Proctodeum Primitive renal duct Genital ridge' Coelom Alimentary tube Hypophysis Stomodeum Hepatic Heart diverticulum Gill cleft Pericardial cavity Fig. 228. Stereograms illustrating early stages in the development of a chordate. The figures are generalized, but in some particulars are based on embryonic stages in such "lower" vertebrates as a shark or amphibian. (A) Shows an earlier and (B) a later stage in the differentiation of the mesoderm. In (C) an embryo at about the stage of (B) is represented a Stock Photo](https://c8.alamy.com/comp/RJ50N7/the-chordates-chordata-reproduction-275-ectoderm-notochord-neurenteric-canal-proctodeum-primitive-renal-duct-genital-ridge-coelom-alimentary-tube-hypophysis-stomodeum-hepatic-heart-diverticulum-gill-cleft-pericardial-cavity-fig-228-stereograms-illustrating-early-stages-in-the-development-of-a-chordate-the-figures-are-generalized-but-in-some-particulars-are-based-on-embryonic-stages-in-such-quotlowerquot-vertebrates-as-a-shark-or-amphibian-a-shows-an-earlier-and-b-a-later-stage-in-the-differentiation-of-the-mesoderm-in-c-an-embryo-at-about-the-stage-of-b-is-represented-a-RJ50N7.jpg ". The chordates. Chordata. Reproduction 275 Ectoderm Notochord. Neurenteric canal Proctodeum Primitive renal duct Genital ridge' Coelom Alimentary tube Hypophysis Stomodeum Hepatic Heart diverticulum Gill cleft Pericardial cavity Fig. 228. Stereograms illustrating early stages in the development of a chordate. The figures are generalized, but in some particulars are based on embryonic stages in such "lower" vertebrates as a shark or amphibian. (A) Shows an earlier and (B) a later stage in the differentiation of the mesoderm. In (C) an embryo at about the stage of (B) is represented a Stock Photo")
. The chordates. Chordata. Reproduction 275 Ectoderm Notochord. Neurenteric canal Proctodeum Primitive renal duct Genital ridge' Coelom Alimentary tube Hypophysis Stomodeum Hepatic Heart diverticulum Gill cleft Pericardial cavity Fig. 228. Stereograms illustrating early stages in the development of a chordate. The figures are generalized, but in some particulars are based on embryonic stages in such "lower" vertebrates as a shark or amphibian. (A) Shows an earlier and (B) a later stage in the differentiation of the mesoderm. In (C) an embryo at about the stage of (B) is represented a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-chordates-chordata-reproduction-275-ectoderm-notochord-neurenteric-canal-proctodeum-primitive-renal-duct-genital-ridge-coelom-alimentary-tube-hypophysis-stomodeum-hepatic-heart-diverticulum-gill-cleft-pericardial-cavity-fig-228-stereograms-illustrating-early-stages-in-the-development-of-a-chordate-the-figures-are-generalized-but-in-some-particulars-are-based-on-embryonic-stages-in-such-quotlowerquot-vertebrates-as-a-shark-or-amphibian-a-shows-an-earlier-and-b-a-later-stage-in-the-differentiation-of-the-mesoderm-in-c-an-embryo-at-about-the-stage-of-b-is-represented-a-image234908947.htmlRMRJ50N7–. The chordates. Chordata. Reproduction 275 Ectoderm Notochord. Neurenteric canal Proctodeum Primitive renal duct Genital ridge' Coelom Alimentary tube Hypophysis Stomodeum Hepatic Heart diverticulum Gill cleft Pericardial cavity Fig. 228. Stereograms illustrating early stages in the development of a chordate. The figures are generalized, but in some particulars are based on embryonic stages in such "lower" vertebrates as a shark or amphibian. (A) Shows an earlier and (B) a later stage in the differentiation of the mesoderm. In (C) an embryo at about the stage of (B) is represented a
![. The Biological bulletin. Biology; Zoology; Marine biology. Figure 9. Post-gastrular stage of Abalus cordatus (100 days after fertilization). (A) Reconstruction of the embryo passing through an ambulacra] and an interambulacral section of the oral face. (B) Section through a primary podium and the ambulacral canal. (C) Oral surface of the future juvenile viewed by SEM when the ectoderm is discarded. (D) Section through the stomodeum area of the postgastrula embryo. (E) Section through the vestibule showing podia and spine buds. Radial nerves are already visible. B, D and E are semi-thin plast Stock Photo](https://c8.alamy.com/comp/RHM86Y/the-biological-bulletin-biology-zoology-marine-biology-figure-9-post-gastrular-stage-of-abalus-cordatus-100-days-after-fertilization-a-reconstruction-of-the-embryo-passing-through-an-ambulacra-and-an-interambulacral-section-of-the-oral-face-b-section-through-a-primary-podium-and-the-ambulacral-canal-c-oral-surface-of-the-future-juvenile-viewed-by-sem-when-the-ectoderm-is-discarded-d-section-through-the-stomodeum-area-of-the-postgastrula-embryo-e-section-through-the-vestibule-showing-podia-and-spine-buds-radial-nerves-are-already-visible-b-d-and-e-are-semi-thin-plast-RHM86Y.jpg ". The Biological bulletin. Biology; Zoology; Marine biology. Figure 9. Post-gastrular stage of Abalus cordatus (100 days after fertilization). (A) Reconstruction of the embryo passing through an ambulacra] and an interambulacral section of the oral face. (B) Section through a primary podium and the ambulacral canal. (C) Oral surface of the future juvenile viewed by SEM when the ectoderm is discarded. (D) Section through the stomodeum area of the postgastrula embryo. (E) Section through the vestibule showing podia and spine buds. Radial nerves are already visible. B, D and E are semi-thin plast Stock Photo")
. The Biological bulletin. Biology; Zoology; Marine biology. Figure 9. Post-gastrular stage of Abalus cordatus (100 days after fertilization). (A) Reconstruction of the embryo passing through an ambulacra] and an interambulacral section of the oral face. (B) Section through a primary podium and the ambulacral canal. (C) Oral surface of the future juvenile viewed by SEM when the ectoderm is discarded. (D) Section through the stomodeum area of the postgastrula embryo. (E) Section through the vestibule showing podia and spine buds. Radial nerves are already visible. B, D and E are semi-thin plast Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-marine-biology-figure-9-post-gastrular-stage-of-abalus-cordatus-100-days-after-fertilization-a-reconstruction-of-the-embryo-passing-through-an-ambulacra-and-an-interambulacral-section-of-the-oral-face-b-section-through-a-primary-podium-and-the-ambulacral-canal-c-oral-surface-of-the-future-juvenile-viewed-by-sem-when-the-ectoderm-is-discarded-d-section-through-the-stomodeum-area-of-the-postgastrula-embryo-e-section-through-the-vestibule-showing-podia-and-spine-buds-radial-nerves-are-already-visible-b-d-and-e-are-semi-thin-plast-image234629443.htmlRMRHM86Y–. The Biological bulletin. Biology; Zoology; Marine biology. Figure 9. Post-gastrular stage of Abalus cordatus (100 days after fertilization). (A) Reconstruction of the embryo passing through an ambulacra] and an interambulacral section of the oral face. (B) Section through a primary podium and the ambulacral canal. (C) Oral surface of the future juvenile viewed by SEM when the ectoderm is discarded. (D) Section through the stomodeum area of the postgastrula embryo. (E) Section through the vestibule showing podia and spine buds. Radial nerves are already visible. B, D and E are semi-thin plast
. The biology of the frog. Frogs. io6 THE BIOLOGY OF THE FROG CHAP. The lining of the mouth cavity is formed from an invagin- ation of ectoderm, the stomodeum, which pushes in until it breaks through into the archenteron. A similar ectodermal invagination, the proctodeum, forms the lining of a small part of the posterior end of the alimentary canal. The lens and Ms c. FlG. 26. — Cross section of a frog embryo. AR, archenteron; MS, meso- blastic somites; N, notochord; NS, neural crest; M, medullary tube; PR, pronephros ; SN, subnotochordal rod ; SO, SP, somatic and splanch- nic mesoderm. (From Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biology-of-the-frog-frogs-io6-the-biology-of-the-frog-chap-the-lining-of-the-mouth-cavity-is-formed-from-an-invagin-ation-of-ectoderm-the-stomodeum-which-pushes-in-until-it-breaks-through-into-the-archenteron-a-similar-ectodermal-invagination-the-proctodeum-forms-the-lining-of-a-small-part-of-the-posterior-end-of-the-alimentary-canal-the-lens-and-ms-c-flg-26-cross-section-of-a-frog-embryo-ar-archenteron-ms-meso-blastic-somites-n-notochord-ns-neural-crest-m-medullary-tube-pr-pronephros-sn-subnotochordal-rod-so-sp-somatic-and-splanch-nic-mesoderm-from-image234607052.htmlRMRHK7K8–. The biology of the frog. Frogs. io6 THE BIOLOGY OF THE FROG CHAP. The lining of the mouth cavity is formed from an invagin- ation of ectoderm, the stomodeum, which pushes in until it breaks through into the archenteron. A similar ectodermal invagination, the proctodeum, forms the lining of a small part of the posterior end of the alimentary canal. The lens and Ms c. FlG. 26. — Cross section of a frog embryo. AR, archenteron; MS, meso- blastic somites; N, notochord; NS, neural crest; M, medullary tube; PR, pronephros ; SN, subnotochordal rod ; SO, SP, somatic and splanch- nic mesoderm. (From
. Human embryology and morphology. Embryology, Human; Morphology. 30 HUMAN EMBRYOLOGY AND MORPHOLOGY. from the body wall behind. Sagittal and coronal sections of the primitive pharynx (Figs. 22 and 23) give a better idea of the dorsum sellae prim, pharynx 2nd cleft recess 3rd cleft recess. max. proc. osition of oral plate stomodeum lung bud Fig. 22.—Showing the Primitive Pharynx of a 3rd week embryo in sagittal section, bounded by the Visceral Arches. (After His.) arrangement and constitution of the visceral arches than can be had from a surface view. They are developed round the most, anterio Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/human-embryology-and-morphology-embryology-human-morphology-30-human-embryology-and-morphology-from-the-body-wall-behind-sagittal-and-coronal-sections-of-the-primitive-pharynx-figs-22-and-23-give-a-better-idea-of-the-dorsum-sellae-prim-pharynx-2nd-cleft-recess-3rd-cleft-recess-max-proc-osition-of-oral-plate-stomodeum-lung-bud-fig-22showing-the-primitive-pharynx-of-a-3rd-week-embryo-in-sagittal-section-bounded-by-the-visceral-arches-after-his-arrangement-and-constitution-of-the-visceral-arches-than-can-be-had-from-a-surface-view-they-are-developed-round-the-most-anterio-image232351103.htmlRMRE0E5K–. Human embryology and morphology. Embryology, Human; Morphology. 30 HUMAN EMBRYOLOGY AND MORPHOLOGY. from the body wall behind. Sagittal and coronal sections of the primitive pharynx (Figs. 22 and 23) give a better idea of the dorsum sellae prim, pharynx 2nd cleft recess 3rd cleft recess. max. proc. osition of oral plate stomodeum lung bud Fig. 22.—Showing the Primitive Pharynx of a 3rd week embryo in sagittal section, bounded by the Visceral Arches. (After His.) arrangement and constitution of the visceral arches than can be had from a surface view. They are developed round the most, anterio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 3. SEM of development through the bipinnaria stage, a. Late blastula within the fertilization membrane, b. Hatching and newly hatched gastrulae. B. blastopore; F. fertilization membrane, c. Gastrula starting to elongate, d. Elongate gastrula. e. Early bipinnaria forming the stomodeal invagination (S). f. Bipinnanal shape starting to develop, the stomodeum (S) has enlarged and the blaslopore has moved to a ventral position to form the anus (A). O, forming oral hood. g. Bipinnaria side view with a distinct oral hood (O) Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-figure-3-sem-of-development-through-the-bipinnaria-stage-a-late-blastula-within-the-fertilization-membrane-b-hatching-and-newly-hatched-gastrulae-b-blastopore-f-fertilization-membrane-c-gastrula-starting-to-elongate-d-elongate-gastrula-e-early-bipinnaria-forming-the-stomodeal-invagination-s-f-bipinnanal-shape-starting-to-develop-the-stomodeum-s-has-enlarged-and-the-blaslopore-has-moved-to-a-ventral-position-to-form-the-anus-a-o-forming-oral-hood-g-bipinnaria-side-view-with-a-distinct-oral-hood-o-image234618632.htmlRMRHKPCT–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 3. SEM of development through the bipinnaria stage, a. Late blastula within the fertilization membrane, b. Hatching and newly hatched gastrulae. B. blastopore; F. fertilization membrane, c. Gastrula starting to elongate, d. Elongate gastrula. e. Early bipinnaria forming the stomodeal invagination (S). f. Bipinnanal shape starting to develop, the stomodeum (S) has enlarged and the blaslopore has moved to a ventral position to form the anus (A). O, forming oral hood. g. Bipinnaria side view with a distinct oral hood (O)
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 A. OKUSU. Trunk Cauda! region Figure 14. Larvae after hatching from the egg capsule (3 days after ovipositon. 1-day-old larvae), (a) Ventral view of the larva with three distinct body regions: ciliated pre-oral apical cap, unciliated trunk, and ciliated caudal region, (b) Vegetal (caudal) view of the trochophore larva showing the small imagination of the stomodeum on the ventral side of the trunk. AT, apical tuft; CD, cerebral depression; Pt, prototroch; Sd. stomo- deum; Tt. telotroch. appears to be secretory, because the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-92-a-okusu-trunk-cauda!-region-figure-14-larvae-after-hatching-from-the-egg-capsule-3-days-after-ovipositon-1-day-old-larvae-a-ventral-view-of-the-larva-with-three-distinct-body-regions-ciliated-pre-oral-apical-cap-unciliated-trunk-and-ciliated-caudal-region-b-vegetal-caudal-view-of-the-trochophore-larva-showing-the-small-imagination-of-the-stomodeum-on-the-ventral-side-of-the-trunk-at-apical-tuft-cd-cerebral-depression-pt-prototroch-sd-stomo-deum-tt-telotroch-appears-to-be-secretory-because-the-image234630170.htmlRMRHM94X–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 92 A. OKUSU. Trunk Cauda! region Figure 14. Larvae after hatching from the egg capsule (3 days after ovipositon. 1-day-old larvae), (a) Ventral view of the larva with three distinct body regions: ciliated pre-oral apical cap, unciliated trunk, and ciliated caudal region, (b) Vegetal (caudal) view of the trochophore larva showing the small imagination of the stomodeum on the ventral side of the trunk. AT, apical tuft; CD, cerebral depression; Pt, prototroch; Sd. stomo- deum; Tt. telotroch. appears to be secretory, because the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 512 JOHN B. MORRILL arrested veligers (Figs. 3, 4, 5) were smaller than the normal 4-day veliger. Their shells were limited to the area of the shell gland primordium on the left posterior side of the embryo; the larval liver cells formed a compact mass of cells separated from the body wall by a fluid-filled space that extended into a rudimentary foot. The stomodeum, radula sac (Fig. 3) and paired cephalic plates 100JJ. R. Please note that these images are extracted from scanned page images that may have been digitally enhanc Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-512-john-b-morrill-arrested-veligers-figs-3-4-5-were-smaller-than-the-normal-4-day-veliger-their-shells-were-limited-to-the-area-of-the-shell-gland-primordium-on-the-left-posterior-side-of-the-embryo-the-larval-liver-cells-formed-a-compact-mass-of-cells-separated-from-the-body-wall-by-a-fluid-filled-space-that-extended-into-a-rudimentary-foot-the-stomodeum-radula-sac-fig-3-and-paired-cephalic-plates-100jj-r-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanc-image234652168.htmlRMRHN96G–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 512 JOHN B. MORRILL arrested veligers (Figs. 3, 4, 5) were smaller than the normal 4-day veliger. Their shells were limited to the area of the shell gland primordium on the left posterior side of the embryo; the larval liver cells formed a compact mass of cells separated from the body wall by a fluid-filled space that extended into a rudimentary foot. The stomodeum, radula sac (Fig. 3) and paired cephalic plates 100JJ. R. Please note that these images are extracted from scanned page images that may have been digitally enhanc
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 258 REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS. Figure 1. (a) Ventral view of an earlv embryo (240 X 175 fjun) showing the stomodeum fS) with phalloidin labeling of the lower lip and lateroventral muscles (LV). (b) Ventral view showing the prototroch (Pi, te/otroch (T), paired midvcinnil muscles (MV), lateroventral muscles (LV), and lateral mu.scli s (L). Circular musculature formation is incomplete, with a gup between the most posterior circular muscle band and the telotroch. (c) Ventrolateral view showing thickened m Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-258-reports-from-the-mbl-general-scientific-meetings-figure-1-a-ventral-view-of-an-earlv-embryo-240-x-175-fjun-showing-the-stomodeum-fs-with-phalloidin-labeling-of-the-lower-lip-and-lateroventral-muscles-lv-b-ventral-view-showing-the-prototroch-pi-teotroch-t-paired-midvcinnil-muscles-mv-lateroventral-muscles-lv-and-lateral-muscli-s-l-circular-musculature-formation-is-incomplete-with-a-gup-between-the-most-posterior-circular-muscle-band-and-the-telotroch-c-ventrolateral-view-showing-thickened-m-image234542812.htmlRMRHG9N0–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 258 REPORTS FROM THE MBL GENERAL SCIENTIFIC MEETINGS. Figure 1. (a) Ventral view of an earlv embryo (240 X 175 fjun) showing the stomodeum fS) with phalloidin labeling of the lower lip and lateroventral muscles (LV). (b) Ventral view showing the prototroch (Pi, te/otroch (T), paired midvcinnil muscles (MV), lateroventral muscles (LV), and lateral mu.scli s (L). Circular musculature formation is incomplete, with a gup between the most posterior circular muscle band and the telotroch. (c) Ventrolateral view showing thickened m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. Left Side View Stomodeum Right Side View. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biologi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-d-left-side-view-stomodeum-right-side-view-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-marine-biological-laboratory-woods-hole-mass-marine-biological-laboratory-woods-hole-mass-annual-report-190708-1952-lillie-frank-rattray-1870-1947-moore-carl-richard-1892-redfield-alfred-clarence-1890-1983-woods-hole-mass-marine-biologi-image234634368.htmlRMRHMEET–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. D. Left Side View Stomodeum Right Side View. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biologi
. Chordate morphology. Morphology (Animals); Chordata. optic vesicle stomodeum solid Rathke's pouch oral sucker hind brain mesenchyme subchordal rod neurenteric canal. (SAGITTAL SECTION) (CROSS SECTION) NEURULA blastopore and posterior neuropore NEURAL TUBE STAGE Figure 7-7. Stages of the frog. Outline of egg with a variety of information superimposed; 4-cell stage as seen in dorsolateral view; 8-cell stoge (note irregularity of cleavage planes separating animal pole cells from those below); 1 6-cell stage (note irregular arrangement of animal pole cells); section through the blastulo; externa Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-morphology-morphology-animals-chordata-optic-vesicle-stomodeum-solid-rathkes-pouch-oral-sucker-hind-brain-mesenchyme-subchordal-rod-neurenteric-canal-sagittal-section-cross-section-neurula-blastopore-and-posterior-neuropore-neural-tube-stage-figure-7-7-stages-of-the-frog-outline-of-egg-with-a-variety-of-information-superimposed-4-cell-stage-as-seen-in-dorsolateral-view-8-cell-stoge-note-irregularity-of-cleavage-planes-separating-animal-pole-cells-from-those-below-1-6-cell-stage-note-irregular-arrangement-of-animal-pole-cells-section-through-the-blastulo-externa-image234907141.htmlRMRJ4XCN–. Chordate morphology. Morphology (Animals); Chordata. optic vesicle stomodeum solid Rathke's pouch oral sucker hind brain mesenchyme subchordal rod neurenteric canal. (SAGITTAL SECTION) (CROSS SECTION) NEURULA blastopore and posterior neuropore NEURAL TUBE STAGE Figure 7-7. Stages of the frog. Outline of egg with a variety of information superimposed; 4-cell stage as seen in dorsolateral view; 8-cell stoge (note irregularity of cleavage planes separating animal pole cells from those below); 1 6-cell stage (note irregular arrangement of animal pole cells); section through the blastulo; externa
. The Biological bulletin. Biology; Zoology; Marine biology. COMPLETELY DIRECT DEVELOPMENT OF AN ECHINOID c 39. Figure 12. Long-spined juvenile (Jj) o{ Abatus cordalus. (A) Section showing the organization of an advanced long-spined juvenile. (B) SEM micrograph of the stomodeum. (C) Transversal semi-thin plastic section (toluidine blue, pH 11.5) through an ambulacral zone. (D) SEM micrography of an ambulacral zone. (E) Semi-thin plastic section (toluidine blue, pH 11.5) through the proctodeal zone. Abbreviations: ap, animal pole; ac and 1, aquiferous canal; amp, primary podia; cc, coelomic cav Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-marine-biology-completely-direct-development-of-an-echinoid-c-39-figure-12-long-spined-juvenile-jj-o-abatus-cordalus-a-section-showing-the-organization-of-an-advanced-long-spined-juvenile-b-sem-micrograph-of-the-stomodeum-c-transversal-semi-thin-plastic-section-toluidine-blue-ph-115-through-an-ambulacral-zone-d-sem-micrography-of-an-ambulacral-zone-e-semi-thin-plastic-section-toluidine-blue-ph-115-through-the-proctodeal-zone-abbreviations-ap-animal-pole-ac-and-1-aquiferous-canal-amp-primary-podia-cc-coelomic-cav-image234629307.htmlRMRHM823–. The Biological bulletin. Biology; Zoology; Marine biology. COMPLETELY DIRECT DEVELOPMENT OF AN ECHINOID c 39. Figure 12. Long-spined juvenile (Jj) o{ Abatus cordalus. (A) Section showing the organization of an advanced long-spined juvenile. (B) SEM micrograph of the stomodeum. (C) Transversal semi-thin plastic section (toluidine blue, pH 11.5) through an ambulacral zone. (D) SEM micrography of an ambulacral zone. (E) Semi-thin plastic section (toluidine blue, pH 11.5) through the proctodeal zone. Abbreviations: ap, animal pole; ac and 1, aquiferous canal; amp, primary podia; cc, coelomic cav
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. vbv •<*%£*& ^MliP* ' '-^^«y^--v. Figure 3. Semithin plastic sections of stages L3 and L4 larvae stained with hematoxylin, eosin. and alcian blue, (a) Early stage L3 larva in sagittal section; ventral is to the left and anterior toward the top of the page, unless noted. Arrow points to algal particle entering stomodeum. Roman numerals denote locations of three trunk coelomic spaces, (b) Higher magnification view of same stage larva as in (a), (c) Oblique frontal section of a late stage L3 larva. Arrow points to an ant Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-vbv-ltamp-mlip-y-v-figure-3-semithin-plastic-sections-of-stages-l3-and-l4-larvae-stained-with-hematoxylin-eosin-and-alcian-blue-a-early-stage-l3-larva-in-sagittal-section-ventral-is-to-the-left-and-anterior-toward-the-top-of-the-page-unless-noted-arrow-points-to-algal-particle-entering-stomodeum-roman-numerals-denote-locations-of-three-trunk-coelomic-spaces-b-higher-magnification-view-of-same-stage-larva-as-in-a-c-oblique-frontal-section-of-a-late-stage-l3-larva-arrow-points-to-an-ant-image234630428.htmlRMRHM9E4–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. vbv •<*%£*& ^MliP* ' '-^^«y^--v. Figure 3. Semithin plastic sections of stages L3 and L4 larvae stained with hematoxylin, eosin. and alcian blue, (a) Early stage L3 larva in sagittal section; ventral is to the left and anterior toward the top of the page, unless noted. Arrow points to algal particle entering stomodeum. Roman numerals denote locations of three trunk coelomic spaces, (b) Higher magnification view of same stage larva as in (a), (c) Oblique frontal section of a late stage L3 larva. Arrow points to an ant
![. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 474 BEN T. PAINTER Case 42 (Fig. 11) shows a regenerating brain and commissures; and an imperforate stomodeum. Figure 10, from another section of the same worm, shows the close relationship between the newly-formed brain and the epidermis. (c) Posterior cord drawn forward into graft. 1. " Sleeve " placed in normal orientation. Case 27 (Figs. 9 and 19).—A sleeve of anterior body-wall segments 4—6 was slipped, in normal orientation, over the intestine and nerve cord of post-clitellar segments 10-12. At the end of two Stock Photo](https://c8.alamy.com/comp/RHP0TD/the-biological-bulletin-biology-zoology-biology-marine-biology-474-ben-t-painter-case-42-fig-11-shows-a-regenerating-brain-and-commissures-and-an-imperforate-stomodeum-figure-10-from-another-section-of-the-same-worm-shows-the-close-relationship-between-the-newly-formed-brain-and-the-epidermis-c-posterior-cord-drawn-forward-into-graft-1-quot-sleeve-quot-placed-in-normal-orientation-case-27-figs-9-and-19a-sleeve-of-anterior-body-wall-segments-46-was-slipped-in-normal-orientation-over-the-intestine-and-nerve-cord-of-post-clitellar-segments-10-12-at-the-end-of-two-RHP0TD.jpg ". The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 474 BEN T. PAINTER Case 42 (Fig. 11) shows a regenerating brain and commissures; and an imperforate stomodeum. Figure 10, from another section of the same worm, shows the close relationship between the newly-formed brain and the epidermis. (c) Posterior cord drawn forward into graft. 1. " Sleeve " placed in normal orientation. Case 27 (Figs. 9 and 19).—A sleeve of anterior body-wall segments 4—6 was slipped, in normal orientation, over the intestine and nerve cord of post-clitellar segments 10-12. At the end of two Stock Photo")
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 474 BEN T. PAINTER Case 42 (Fig. 11) shows a regenerating brain and commissures; and an imperforate stomodeum. Figure 10, from another section of the same worm, shows the close relationship between the newly-formed brain and the epidermis. (c) Posterior cord drawn forward into graft. 1. " Sleeve " placed in normal orientation. Case 27 (Figs. 9 and 19).—A sleeve of anterior body-wall segments 4—6 was slipped, in normal orientation, over the intestine and nerve cord of post-clitellar segments 10-12. At the end of two Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-474-ben-t-painter-case-42-fig-11-shows-a-regenerating-brain-and-commissures-and-an-imperforate-stomodeum-figure-10-from-another-section-of-the-same-worm-shows-the-close-relationship-between-the-newly-formed-brain-and-the-epidermis-c-posterior-cord-drawn-forward-into-graft-1-quot-sleeve-quot-placed-in-normal-orientation-case-27-figs-9-and-19a-sleeve-of-anterior-body-wall-segments-46-was-slipped-in-normal-orientation-over-the-intestine-and-nerve-cord-of-post-clitellar-segments-10-12-at-the-end-of-two-image234667565.htmlRMRHP0TD–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 474 BEN T. PAINTER Case 42 (Fig. 11) shows a regenerating brain and commissures; and an imperforate stomodeum. Figure 10, from another section of the same worm, shows the close relationship between the newly-formed brain and the epidermis. (c) Posterior cord drawn forward into graft. 1. " Sleeve " placed in normal orientation. Case 27 (Figs. 9 and 19).—A sleeve of anterior body-wall segments 4—6 was slipped, in normal orientation, over the intestine and nerve cord of post-clitellar segments 10-12. At the end of two
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Pgc FIG. 2. A longitudinal section through an egg of Leptinotarsa decemlineata one day after deposition when in the blastoderm stage, bl, blastoderm; pgc, primordial germ cells; v, vitellophag; y, yolk. FIG. 3. Superficial view of the right side of an egg of Leptinotarsa decemlineata thirty-six hours after deposition, gb, germ band; pgc, primordial germ cells; pi, procephalic lobes; s, stomodeum; vg, ventral groove. FIG. 4. Surface view of right side of an egg of Leptinotarsa decemlineata forty- eight hours after deposition, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-pgc-fig-2-a-longitudinal-section-through-an-egg-of-leptinotarsa-decemlineata-one-day-after-deposition-when-in-the-blastoderm-stage-bl-blastoderm-pgc-primordial-germ-cells-v-vitellophag-y-yolk-fig-3-superficial-view-of-the-right-side-of-an-egg-of-leptinotarsa-decemlineata-thirty-six-hours-after-deposition-gb-germ-band-pgc-primordial-germ-cells-pi-procephalic-lobes-s-stomodeum-vg-ventral-groove-fig-4-surface-view-of-right-side-of-an-egg-of-leptinotarsa-decemlineata-forty-eight-hours-after-deposition-image234695027.htmlRMRHR7W7–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Pgc FIG. 2. A longitudinal section through an egg of Leptinotarsa decemlineata one day after deposition when in the blastoderm stage, bl, blastoderm; pgc, primordial germ cells; v, vitellophag; y, yolk. FIG. 3. Superficial view of the right side of an egg of Leptinotarsa decemlineata thirty-six hours after deposition, gb, germ band; pgc, primordial germ cells; pi, procephalic lobes; s, stomodeum; vg, ventral groove. FIG. 4. Surface view of right side of an egg of Leptinotarsa decemlineata forty- eight hours after deposition,
. A manual of zoology. Zoology. Fig. 376. Fig. 377. Fig. sjG.—Apus equalis* (after Packard). Fig. 377.—Antennal gland of Mysis (after Grobben). external opening; /(, bladder; re, canal; 5, internal vesicle. Fig. 37S.—Otocyst of craylishi. as, crista acustica; n, nen'e. Fig. 373. blr, blood lacunre; ea. Concerning the internal organs-but few general remarks can be made. Salivary glands are wdiolly absent; on the other hand, the stomodeum is usually widened into a strong chewing 'stomach,' and behind this empty the ducts of the so-called liver. Tliis varies lietween the two simple blind sacs of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-376-fig-377-fig-sjgapus-equalis-after-packard-fig-377antennal-gland-of-mysis-after-grobben-external-opening-bladder-re-canal-5-internal-vesicle-fig-37sotocyst-of-craylishi-as-crista-acustica-n-nene-fig-373-blr-blood-lacunre-ea-concerning-the-internal-organs-but-few-general-remarks-can-be-made-salivary-glands-are-wdiolly-absent-on-the-other-hand-the-stomodeum-is-usually-widened-into-a-strong-chewing-stomach-and-behind-this-empty-the-ducts-of-the-so-called-liver-tliis-varies-lietween-the-two-simple-blind-sacs-of-image232132388.htmlRMRDJF6C–. A manual of zoology. Zoology. Fig. 376. Fig. 377. Fig. sjG.—Apus equalis* (after Packard). Fig. 377.—Antennal gland of Mysis (after Grobben). external opening; /(, bladder; re, canal; 5, internal vesicle. Fig. 37S.—Otocyst of craylishi. as, crista acustica; n, nen'e. Fig. 373. blr, blood lacunre; ea. Concerning the internal organs-but few general remarks can be made. Salivary glands are wdiolly absent; on the other hand, the stomodeum is usually widened into a strong chewing 'stomach,' and behind this empty the ducts of the so-called liver. Tliis varies lietween the two simple blind sacs of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GENE DEPENDENCY IN SEA URCHIN EMBRYOS 407. Designations in FIGURES 9-12: Figure 9, horizontal arrow: ectodermic bulge with squamous epithelium; vertical arrow; enlarged intestine opening through the bulge; 320 X. Figure 10, vertical and horizontal arrow: bulge; oblique arrow, opening of the intestine. 160 X. See for Figures 9 and 10, Table 1; D, Li0. Figure 11, horizontal arrow: oral field with stomodeum. 160 X. Figure 12, vertical arrow head: oral lobe with rudiment of oral arms with projecting skeleton rods; horizontal arr Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-gene-dependency-in-sea-urchin-embryos-407-designations-in-figures-9-12-figure-9-horizontal-arrow-ectodermic-bulge-with-squamous-epithelium-vertical-arrow-enlarged-intestine-opening-through-the-bulge-320-x-figure-10-vertical-and-horizontal-arrow-bulge-oblique-arrow-opening-of-the-intestine-160-x-see-for-figures-9-and-10-table-1-d-li0-figure-11-horizontal-arrow-oral-field-with-stomodeum-160-x-figure-12-vertical-arrow-head-oral-lobe-with-rudiment-of-oral-arms-with-projecting-skeleton-rods-horizontal-arr-image234652290.htmlRMRHN9AX–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GENE DEPENDENCY IN SEA URCHIN EMBRYOS 407. Designations in FIGURES 9-12: Figure 9, horizontal arrow: ectodermic bulge with squamous epithelium; vertical arrow; enlarged intestine opening through the bulge; 320 X. Figure 10, vertical and horizontal arrow: bulge; oblique arrow, opening of the intestine. 160 X. See for Figures 9 and 10, Table 1; D, Li0. Figure 11, horizontal arrow: oral field with stomodeum. 160 X. Figure 12, vertical arrow head: oral lobe with rudiment of oral arms with projecting skeleton rods; horizontal arr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EMBRYONIC PLEON OF CRA^i I ISM 159. V » te Figure 1. Formation of engrailed stripes: st. stomodeum; cp. caudal papilla; te. telson anlage: up. uropods. (A) Germ band at 40% to 42% development. All engrailed stripes of head and thorax are formed. The engrailed stripe marking the first pleonic segment appears (arrow) on the ventral side of the ventrally Hexed caudal papilla. (B) Posterior part of the caudal papilla of an embryo at 45% development (ventral view). The engrailed stripes up to the third pleonic segment (1, 2. 3) a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-embryonic-pleon-of-crai-i-ism-159-v-te-figure-1-formation-of-engrailed-stripes-st-stomodeum-cp-caudal-papilla-te-telson-anlage-up-uropods-a-germ-band-at-40-to-42-development-all-engrailed-stripes-of-head-and-thorax-are-formed-the-engrailed-stripe-marking-the-first-pleonic-segment-appears-arrow-on-the-ventral-side-of-the-ventrally-hexed-caudal-papilla-b-posterior-part-of-the-caudal-papilla-of-an-embryo-at-45-development-ventral-view-the-engrailed-stripes-up-to-the-third-pleonic-segment-1-2-3-a-image234632360.htmlRMRHMBY4–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EMBRYONIC PLEON OF CRA^i I ISM 159. V » te Figure 1. Formation of engrailed stripes: st. stomodeum; cp. caudal papilla; te. telson anlage: up. uropods. (A) Germ band at 40% to 42% development. All engrailed stripes of head and thorax are formed. The engrailed stripe marking the first pleonic segment appears (arrow) on the ventral side of the ventrally Hexed caudal papilla. (B) Posterior part of the caudal papilla of an embryo at 45% development (ventral view). The engrailed stripes up to the third pleonic segment (1, 2. 3) a
. A manual of zoology. Zoology. Fig. 283. Fig. 2S4. Fig. 283.—Three stages in the development of the coelom and water-vascular system (after Bury and McBride). a, ampulla; b, stone canal; c', c'-, left and right ccelom sacs; d, hind gut with anus; h h'-, left and right (rudimentary) hydrocoele sac; he, common anlage of hydrocccle and co^loni; m, stomach; 5, stomodeum and mouth. Fig. 284.—Formation of Ophiuran from the pluteus larva (after MuUer, from Korshelt-Heider). Class I. Asteroidea (Starfish). Two parts can be recognized in the body of a starfish, a central disc and the arms, usually fi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-283-fig-2s4-fig-283three-stages-in-the-development-of-the-coelom-and-water-vascular-system-after-bury-and-mcbride-a-ampulla-b-stone-canal-c-c-left-and-right-ccelom-sacs-d-hind-gut-with-anus-h-h-left-and-right-rudimentary-hydrocoele-sac-he-common-anlage-of-hydrocccle-and-coloni-m-stomach-5-stomodeum-and-mouth-fig-284formation-of-ophiuran-from-the-pluteus-larva-after-muuer-from-korshelt-heider-class-i-asteroidea-starfish-two-parts-can-be-recognized-in-the-body-of-a-starfish-a-central-disc-and-the-arms-usually-fi-image232133194.htmlRMRDJG76–. A manual of zoology. Zoology. Fig. 283. Fig. 2S4. Fig. 283.—Three stages in the development of the coelom and water-vascular system (after Bury and McBride). a, ampulla; b, stone canal; c', c'-, left and right ccelom sacs; d, hind gut with anus; h h'-, left and right (rudimentary) hydrocoele sac; he, common anlage of hydrocccle and co^loni; m, stomach; 5, stomodeum and mouth. Fig. 284.—Formation of Ophiuran from the pluteus larva (after MuUer, from Korshelt-Heider). Class I. Asteroidea (Starfish). Two parts can be recognized in the body of a starfish, a central disc and the arms, usually fi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEOMENIOID APLACOPHORAN DEVELOPMENT 95. *•.* ' -t» •••;.&*.• •-Jf ••«?» •.?• „, ••. ••• *• v •••'•• •;>* ' ^K&w; ^ iB&imityj • * . * Sd Figures 20-22. Development of stomodeum. globules, and cerebral depression of I- to 3-day-old larvae. 20a. SEM image at the first sign of the stomodeal imagination on the trunk just beneath the apical cap. 20b. Light microscope image of a histological section through the ciliated stomodeum. 21a. SEM image of a globule (Figs. 17. 18) with an unciliated surface and a hole (arrow Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-neomenioid-aplacophoran-development-95-t-amp-jf-v-gt-kampw-ibampimityj-sd-figures-20-22-development-of-stomodeum-globules-and-cerebral-depression-of-i-to-3-day-old-larvae-20a-sem-image-at-the-first-sign-of-the-stomodeal-imagination-on-the-trunk-just-beneath-the-apical-cap-20b-light-microscope-image-of-a-histological-section-through-the-ciliated-stomodeum-21a-sem-image-of-a-globule-figs-17-18-with-an-unciliated-surface-and-a-hole-arrow-image234630130.htmlRMRHM93E–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEOMENIOID APLACOPHORAN DEVELOPMENT 95. *•.* ' -t» •••;.&*.• •-Jf ••«?» •.?• „, ••. ••• *• v •••'•• •;>* ' ^K&w; ^ iB&imityj • * . * Sd Figures 20-22. Development of stomodeum. globules, and cerebral depression of I- to 3-day-old larvae. 20a. SEM image at the first sign of the stomodeal imagination on the trunk just beneath the apical cap. 20b. Light microscope image of a histological section through the ciliated stomodeum. 21a. SEM image of a globule (Figs. 17. 18) with an unciliated surface and a hole (arrow
. Bulletin biologique de la France et de la Belgique. Biology; Natural history. 394 GEORGES DAUMEZON. beaucoup plus tard et il considère ce retard : « comme une obser- vation absolument convaincante sur l'indépendance du S3^stême nerveux et de l'organe vibratile embryonnaire ». Sur la fig. 42 on le voit s'ouvrir en avant au niveau du stomodeum. A ce stade, la cavité nerveuse communique donc avec la cavité entérique, mais cette communica- tion ne durera pas longtemps. Plus tard, on aperçoit la communication du tube dorsal et de la vésicule sensorielle qui commence à s'étran- gler. La Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bulletin-biologique-de-la-france-et-de-la-belgique-biology-natural-history-394-georges-daumezon-beaucoup-plus-tard-et-il-considre-ce-retard-comme-une-obser-vation-absolument-convaincante-sur-lindpendance-du-s3stme-nerveux-et-de-lorgane-vibratile-embryonnaire-sur-la-fig-42-on-le-voit-souvrir-en-avant-au-niveau-du-stomodeum-a-ce-stade-la-cavit-nerveuse-communique-donc-avec-la-cavit-entrique-mais-cette-communica-tion-ne-durera-pas-longtemps-plus-tard-on-aperoit-la-communication-du-tube-dorsal-et-de-la-vsicule-sensorielle-qui-commence-stran-gler-la-image234100305.htmlRMRGT595–. Bulletin biologique de la France et de la Belgique. Biology; Natural history. 394 GEORGES DAUMEZON. beaucoup plus tard et il considère ce retard : « comme une obser- vation absolument convaincante sur l'indépendance du S3^stême nerveux et de l'organe vibratile embryonnaire ». Sur la fig. 42 on le voit s'ouvrir en avant au niveau du stomodeum. A ce stade, la cavité nerveuse communique donc avec la cavité entérique, mais cette communica- tion ne durera pas longtemps. Plus tard, on aperçoit la communication du tube dorsal et de la vésicule sensorielle qui commence à s'étran- gler. La
. Bulletin biologique de la France et de la Belgique. Biology; Natural history. ÃTUnE DES SYNASCIDIES. 383 page 379) ; mais bientôt apparaissent, à partir de la base de cette dernière, de profondes modifications. Chez un même embryon, ces modifications sont d'autant plus considérables que l'on examine une partie plus proximale, c'est-à -dire plus âgée de la queue. Chez un embryon dont le stomodeum est déjà ouvert, la partie dislale de la queue montre encore les grandes cellules éosinophiles et (â omi)actes de la chorde primitive, mais ces cellules ont déjà pris une forme nettement amp Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bulletin-biologique-de-la-france-et-de-la-belgique-biology-natural-history-tune-des-synascidies-383-page-379-mais-bientt-apparaissent-partir-de-la-base-de-cette-dernire-de-profondes-modifications-chez-un-mme-embryon-ces-modifications-sont-dautant-plus-considrables-que-lon-examine-une-partie-plus-proximale-cest-dire-plus-ge-de-la-queue-chez-un-embryon-dont-le-stomodeum-est-dj-ouvert-la-partie-dislale-de-la-queue-montre-encore-les-grandes-cellules-osinophiles-et-omiactes-de-la-chorde-primitive-mais-ces-cellules-ont-dj-pris-une-forme-nettement-amp-image234100376.htmlRMRGT5BM–. Bulletin biologique de la France et de la Belgique. Biology; Natural history. ÃTUnE DES SYNASCIDIES. 383 page 379) ; mais bientôt apparaissent, à partir de la base de cette dernière, de profondes modifications. Chez un même embryon, ces modifications sont d'autant plus considérables que l'on examine une partie plus proximale, c'est-à -dire plus âgée de la queue. Chez un embryon dont le stomodeum est déjà ouvert, la partie dislale de la queue montre encore les grandes cellules éosinophiles et (â omi)actes de la chorde primitive, mais ces cellules ont déjà pris une forme nettement amp
. Contribution à l'étude des Gastéropodes, opisthobranches et en particulier des Céphalaspides. Opisthobranchia. GASTEROPODES OPISTHOBRANCHES 171 pour eu permettre la contraction. La contraction alternative de ce sinus et de celui du pied produit le brassîJge continu du liquide contenu à l'intérieur du corps de la larve et permet par suite la respiration et la circulation de ce liquide. Tube digestif. â Nous avons assisté à la formation de l'archen- teron et du stomodeum ; quand ces deux cavités sont entrées en contact, Tarchenteron prend la forme d'une poire unie au stomo- deum par sa Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/contribution-ltude-des-gastropodes-opisthobranches-et-en-particulier-des-cphalaspides-opisthobranchia-gasteropodes-opisthobranches-171-pour-eu-permettre-la-contraction-la-contraction-alternative-de-ce-sinus-et-de-celui-du-pied-produit-le-brassjge-continu-du-liquide-contenu-lintrieur-du-corps-de-la-larve-et-permet-par-suite-la-respiration-et-la-circulation-de-ce-liquide-tube-digestif-nous-avons-assist-la-formation-de-larchen-teron-et-du-stomodeum-quand-ces-deux-cavits-sont-entres-en-contact-tarchenteron-prend-la-forme-dune-poire-unie-au-stomo-deum-par-sa-image232557946.htmlRMRE9X0X–. Contribution à l'étude des Gastéropodes, opisthobranches et en particulier des Céphalaspides. Opisthobranchia. GASTEROPODES OPISTHOBRANCHES 171 pour eu permettre la contraction. La contraction alternative de ce sinus et de celui du pied produit le brassîJge continu du liquide contenu à l'intérieur du corps de la larve et permet par suite la respiration et la circulation de ce liquide. Tube digestif. â Nous avons assisté à la formation de l'archen- teron et du stomodeum ; quand ces deux cavités sont entrées en contact, Tarchenteron prend la forme d'une poire unie au stomo- deum par sa
![. Bulletin biologique de la France et de la Belgique. Biology; Natural history. ETUDE DES SYNASGIDIES. 417 Maurice [1888] a constaté, chez le blastozoïde de Fragaroides aurantiacum (Polyclinidés), un passage insensible entre 1 epithélium. FiG. 54. â Coupe sagittale à travers la région dorsale du corps d'un embryon au moment de la formation du stomodeum. (Le tube dorsal td. commence en réalité un peu en avant du point où il est indiqué, au dessus sur la figure du pigment oculaire ^j o.) Gr. := 240. Åsophagien et l'épithélium branchial. Nous avons constaté le contraire chez le blasto Stock Photo](https://c8.alamy.com/comp/RGTDT5/bulletin-biologique-de-la-france-et-de-la-belgique-biology-natural-history-etude-des-synasgidies-417-maurice-1888-a-constat-chez-le-blastozode-de-fragaroides-aurantiacum-polyclinids-un-passage-insensible-entre-1-epithlium-fig-54-coupe-sagittale-travers-la-rgion-dorsale-du-corps-dun-embryon-au-moment-de-la-formation-du-stomodeum-le-tube-dorsal-td-commence-en-ralit-un-peu-en-avant-du-point-o-il-est-indiqu-au-dessus-sur-la-figure-du-pigment-oculaire-j-o-gr-=-240-sophagien-et-lpithlium-branchial-nous-avons-constat-le-contraire-chez-le-blasto-RGTDT5.jpg ". Bulletin biologique de la France et de la Belgique. Biology; Natural history. ETUDE DES SYNASGIDIES. 417 Maurice [1888] a constaté, chez le blastozoïde de Fragaroides aurantiacum (Polyclinidés), un passage insensible entre 1 epithélium. FiG. 54. â Coupe sagittale à travers la région dorsale du corps d'un embryon au moment de la formation du stomodeum. (Le tube dorsal td. commence en réalité un peu en avant du point où il est indiqué, au dessus sur la figure du pigment oculaire ^j o.) Gr. := 240. Åsophagien et l'épithélium branchial. Nous avons constaté le contraire chez le blasto Stock Photo")
. Bulletin biologique de la France et de la Belgique. Biology; Natural history. ETUDE DES SYNASGIDIES. 417 Maurice [1888] a constaté, chez le blastozoïde de Fragaroides aurantiacum (Polyclinidés), un passage insensible entre 1 epithélium. FiG. 54. â Coupe sagittale à travers la région dorsale du corps d'un embryon au moment de la formation du stomodeum. (Le tube dorsal td. commence en réalité un peu en avant du point où il est indiqué, au dessus sur la figure du pigment oculaire ^j o.) Gr. := 240. Åsophagien et l'épithélium branchial. Nous avons constaté le contraire chez le blasto Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bulletin-biologique-de-la-france-et-de-la-belgique-biology-natural-history-etude-des-synasgidies-417-maurice-1888-a-constat-chez-le-blastozode-de-fragaroides-aurantiacum-polyclinids-un-passage-insensible-entre-1-epithlium-fig-54-coupe-sagittale-travers-la-rgion-dorsale-du-corps-dun-embryon-au-moment-de-la-formation-du-stomodeum-le-tube-dorsal-td-commence-en-ralit-un-peu-en-avant-du-point-o-il-est-indiqu-au-dessus-sur-la-figure-du-pigment-oculaire-j-o-gr-=-240-sophagien-et-lpithlium-branchial-nous-avons-constat-le-contraire-chez-le-blasto-image234106997.htmlRMRGTDT5–. Bulletin biologique de la France et de la Belgique. Biology; Natural history. ETUDE DES SYNASGIDIES. 417 Maurice [1888] a constaté, chez le blastozoïde de Fragaroides aurantiacum (Polyclinidés), un passage insensible entre 1 epithélium. FiG. 54. â Coupe sagittale à travers la région dorsale du corps d'un embryon au moment de la formation du stomodeum. (Le tube dorsal td. commence en réalité un peu en avant du point où il est indiqué, au dessus sur la figure du pigment oculaire ^j o.) Gr. := 240. Åsophagien et l'épithélium branchial. Nous avons constaté le contraire chez le blasto
. Embryology. Embryology; Embryology; genealogy. PHARYNX DORSAL AORTA ANTERIOR CARDINAL VEIN MYELENCEPHALON VISCERAL POUCH VISCERAL GROOVE Fig. 136. The hypophysis, aortic arch, and visceral pouch of a 48-hour chick embryo. STOMODEUM LENS VESICLE OPTIC CUP DIENCEPHALON AORTIC ARCH. VISCERAL ARCH FIRST SOMITE ANTERIOR CARDINAL VEIN DORSAL AORTA Fig. 137. Optic cup and lens vesicle of a 48-hour chick embryo. 218. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not per Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-embryology-embryology-genealogy-pharynx-dorsal-aorta-anterior-cardinal-vein-myelencephalon-visceral-pouch-visceral-groove-fig-136-the-hypophysis-aortic-arch-and-visceral-pouch-of-a-48-hour-chick-embryo-stomodeum-lens-vesicle-optic-cup-diencephalon-aortic-arch-visceral-arch-first-somite-anterior-cardinal-vein-dorsal-aorta-fig-137-optic-cup-and-lens-vesicle-of-a-48-hour-chick-embryo-218-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-per-image231282229.htmlRMRC7PRH–. Embryology. Embryology; Embryology; genealogy. PHARYNX DORSAL AORTA ANTERIOR CARDINAL VEIN MYELENCEPHALON VISCERAL POUCH VISCERAL GROOVE Fig. 136. The hypophysis, aortic arch, and visceral pouch of a 48-hour chick embryo. STOMODEUM LENS VESICLE OPTIC CUP DIENCEPHALON AORTIC ARCH. VISCERAL ARCH FIRST SOMITE ANTERIOR CARDINAL VEIN DORSAL AORTA Fig. 137. Optic cup and lens vesicle of a 48-hour chick embryo. 218. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not per
![. Comparative anatomy. Anatomy, Comparative. THE ANCESTRY OF THE VERTEBRATES stc. p.e. p Of g- St c- 655. Thp^ ?i'iâ/t?;T°Vi?''^â¢u '"ustratmg the principal stages in the evolution of segmented animals. rln=r^â ^f fvfi li substitution of one organ for another. The most striking illustration is the ,>, ?l»^.» â ?! "IT^^"- f-n'i stomodeum and the formation of a new opening into the mesenteron k thl ^t^^Zi- *''«,dorsal organ ; the substitution of lungs for gills. The most striking innovation ^PtTJilJl^^- % * D "If"^ ^^P^''^^"? gill sacs and enteric diverticula Stock Photo](https://c8.alamy.com/comp/REF6AF/comparative-anatomy-anatomy-comparative-the-ancestry-of-the-vertebrates-stc-pe-p-of-g-st-c-655-thp-iittviu-quotustratmg-the-principal-stages-in-the-evolution-of-segmented-animals-rln=r-f-fvfi-li-substitution-of-one-organ-for-another-the-most-striking-illustration-is-the-gt-l-!-quotitquot-f-ni-stomodeum-and-the-formation-of-a-new-opening-into-the-mesenteron-k-thl-tzi-dorsal-organ-the-substitution-of-lungs-for-gills-the-most-striking-innovation-pttjiljl-d-quotifquot-pquot-gill-sacs-and-enteric-diverticula-REF6AF.jpg ". Comparative anatomy. Anatomy, Comparative. THE ANCESTRY OF THE VERTEBRATES stc. p.e. p Of g- St c- 655. Thp^ ?i'iâ/t?;T°Vi?''^â¢u '"ustratmg the principal stages in the evolution of segmented animals. rln=r^â ^f fvfi li substitution of one organ for another. The most striking illustration is the ,>, ?l»^.» â ?! "IT^^"- f-n'i stomodeum and the formation of a new opening into the mesenteron k thl ^t^^Zi- *''«,dorsal organ ; the substitution of lungs for gills. The most striking innovation ^PtTJilJl^^- % * D "If"^ ^^P^''^^"? gill sacs and enteric diverticula Stock Photo")
. Comparative anatomy. Anatomy, Comparative. THE ANCESTRY OF THE VERTEBRATES stc. p.e. p Of g- St c- 655. Thp^ ?i'iâ/t?;T°Vi?''^â¢u '"ustratmg the principal stages in the evolution of segmented animals. rln=r^â ^f fvfi li substitution of one organ for another. The most striking illustration is the ,>, ?l»^.» â ?! "IT^^"- f-n'i stomodeum and the formation of a new opening into the mesenteron k thl ^t^^Zi- *''«,dorsal organ ; the substitution of lungs for gills. The most striking innovation ^PtTJilJl^^- % * D "If"^ ^^P^''^^"? gill sacs and enteric diverticula Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-the-ancestry-of-the-vertebrates-stc-pe-p-of-g-st-c-655-thp-iittviu-quotustratmg-the-principal-stages-in-the-evolution-of-segmented-animals-rln=r-f-fvfi-li-substitution-of-one-organ-for-another-the-most-striking-illustration-is-the-gt-l-!-quotitquot-f-ni-stomodeum-and-the-formation-of-a-new-opening-into-the-mesenteron-k-thl-tzi-dorsal-organ-the-substitution-of-lungs-for-gills-the-most-striking-innovation-pttjiljl-d-quotifquot-pquot-gill-sacs-and-enteric-diverticula-image232674247.htmlRMREF6AF–. Comparative anatomy. Anatomy, Comparative. THE ANCESTRY OF THE VERTEBRATES stc. p.e. p Of g- St c- 655. Thp^ ?i'iâ/t?;T°Vi?''^â¢u '"ustratmg the principal stages in the evolution of segmented animals. rln=r^â ^f fvfi li substitution of one organ for another. The most striking illustration is the ,>, ?l»^.» â ?! "IT^^"- f-n'i stomodeum and the formation of a new opening into the mesenteron k thl ^t^^Zi- *''«,dorsal organ ; the substitution of lungs for gills. The most striking innovation ^PtTJilJl^^- % * D "If"^ ^^P^''^^"? gill sacs and enteric diverticula
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