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Introduction à l'étude des mollusques . soit avec lesreins, soit directement avec lextérieur. Dans ce dernier cas, uneinvagination ectodermique rejoint la glande et forme éventuellementles glandes accessoires qui se trouvent sur le conduit génital. B. Appareil circulatoire {cœur). — Le cœur se forme dune partiedu blastocèle senfonçant dans le péricarde, en en soulevant la paroi,dont une partie devient ainsi celle du cœur (fig. 140). XIV XVII 8. Définition générale. — Pour résumer : Les Mollusques sont,au moins originairement, des animaux à symétrie bilatérale, à cavités digestive, cœlomique et Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/introduction-ltude-des-mollusques-soit-avec-lesreins-soit-directement-avec-lextrieur-dans-ce-dernier-cas-uneinvagination-ectodermique-rejoint-la-glande-et-forme-ventuellementles-glandes-accessoires-qui-se-trouvent-sur-le-conduit-gnital-b-appareil-circulatoire-cur-le-cur-se-forme-dune-partiedu-blastocle-senfonant-dans-le-pricarde-en-en-soulevant-la-paroidont-une-partie-devient-ainsi-celle-du-cur-fig-140-xiv-xvii-8-dfinition-gnrale-pour-rsumer-les-mollusques-sontau-moins-originairement-des-animaux-symtrie-bilatrale-cavits-digestive-clomique-et-image338380499.htmlRM2AJEFNR–Introduction à l'étude des mollusques . soit avec lesreins, soit directement avec lextérieur. Dans ce dernier cas, uneinvagination ectodermique rejoint la glande et forme éventuellementles glandes accessoires qui se trouvent sur le conduit génital. B. Appareil circulatoire {cœur). — Le cœur se forme dune partiedu blastocèle senfonçant dans le péricarde, en en soulevant la paroi,dont une partie devient ainsi celle du cœur (fig. 140). XIV XVII 8. Définition générale. — Pour résumer : Les Mollusques sont,au moins originairement, des animaux à symétrie bilatérale, à cavités digestive, cœlomique et
Implantation Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-implantation-14032617.htmlRFAFX6BP–Implantation
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 68 COMPARATIVE PHYSIOLOGY. form of segmentation than as applicable to all, for even at this early stage differences are to be noted in the mode of seg- mentation which characterize effectually certain groups of ani- mals ; but in all there is segmentation, and that segmentation is rhythmical. Segmentation results in the formation of a multicellular aggregation which, sooner or later, incloses a central cavity (segmentation cavity, blastocele). Usually this cell Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-text-book-of-comparative-physiology-for-students-and-practitioners-of-comparative-veterinary-medicine-physiology-comparative-68-comparative-physiology-form-of-segmentation-than-as-applicable-to-all-for-even-at-this-early-stage-differences-are-to-be-noted-in-the-mode-of-seg-mentation-which-characterize-effectually-certain-groups-of-ani-mals-but-in-all-there-is-segmentation-and-that-segmentation-is-rhythmical-segmentation-results-in-the-formation-of-a-multicellular-aggregation-which-sooner-or-later-incloses-a-central-cavity-segmentation-cavity-blastocele-usually-this-cell-image232343736.htmlRMRE04PG–. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 68 COMPARATIVE PHYSIOLOGY. form of segmentation than as applicable to all, for even at this early stage differences are to be noted in the mode of seg- mentation which characterize effectually certain groups of ani- mals ; but in all there is segmentation, and that segmentation is rhythmical. Segmentation results in the formation of a multicellular aggregation which, sooner or later, incloses a central cavity (segmentation cavity, blastocele). Usually this cell
Implantation Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-implantation-14032046.htmlRFAFX4KY–Implantation
. Chordate anatomy. Chordata; Anatomy, Comparative. 42 CHORDATE ANATOMY as in Amphioxus, becomes a hollow sphere or blastula (Fig. 35£). Its cavity (blastocoele) is excentric, occupying approximately the animal hemisphere only. Its wall is more than one cell thick. The great thick- ^,T-,^,«*w,-., ness of the wall of the vegetal hemi- Y' sphere and the consequent excen- tricity of the blastocele are obviously due to the yolk. In Reptiles and Birds. In eggs whose yolk-mass greatly exceeds that of the amphibian egg all the proto- plasm is segregated into a thin plate, the germ-disc, lying on the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/chordate-anatomy-chordata-anatomy-comparative-42-chordate-anatomy-as-in-amphioxus-becomes-a-hollow-sphere-or-blastula-fig-35-its-cavity-blastocoele-is-excentric-occupying-approximately-the-animal-hemisphere-only-its-wall-is-more-than-one-cell-thick-the-great-thick-t-w-ness-of-the-wall-of-the-vegetal-hemi-y-sphere-and-the-consequent-excen-tricity-of-the-blastocele-are-obviously-due-to-the-yolk-in-reptiles-and-birds-in-eggs-whose-yolk-mass-greatly-exceeds-that-of-the-amphibian-egg-all-the-proto-plasm-is-segregated-into-a-thin-plate-the-germ-disc-lying-on-the-image234918204.htmlRMRJ5CFT–. Chordate anatomy. Chordata; Anatomy, Comparative. 42 CHORDATE ANATOMY as in Amphioxus, becomes a hollow sphere or blastula (Fig. 35£). Its cavity (blastocoele) is excentric, occupying approximately the animal hemisphere only. Its wall is more than one cell thick. The great thick- ^,T-,^,«*w,-., ness of the wall of the vegetal hemi- Y' sphere and the consequent excen- tricity of the blastocele are obviously due to the yolk. In Reptiles and Birds. In eggs whose yolk-mass greatly exceeds that of the amphibian egg all the proto- plasm is segregated into a thin plate, the germ-disc, lying on the
. Annales de la Société royale malacologique de Belgique. Mollusks; Zoology. Fig. 11. — Coupe transversale d'un embryon de Chiton, passant par le vélum, X 200; d'après Kowalevsky. I, œsophage; II, cœ- lome; III, cordons nerveux; IV, partie antérieure de la cavité buccale; V, méso- derme ; VI, cellules ectodermiques du voile ; VII, endoderme (estomac). dermiques s'étendent entre l'endoderme et l'ectoderme, pour former le revêtement intérieur de cette cavité circulatoire; par spécialisation, ces éléments peuvent remplir presque complètement le reste du blastocèle, sous forme d'un faux mésencliym Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/annales-de-la-socit-royale-malacologique-de-belgique-mollusks-zoology-fig-11-coupe-transversale-dun-embryon-de-chiton-passant-par-le-vlum-x-200-daprs-kowalevsky-i-sophage-ii-c-lome-iii-cordons-nerveux-iv-partie-antrieure-de-la-cavit-buccale-v-mso-derme-vi-cellules-ectodermiques-du-voile-vii-endoderme-estomac-dermiques-stendent-entre-lendoderme-et-lectoderme-pour-former-le-revtement-intrieur-de-cette-cavit-circulatoire-par-spcialisation-ces-lments-peuvent-remplir-presque-compltement-le-reste-du-blastocle-sous-forme-dun-faux-msencliym-image236696757.htmlRMRN2D3H–. Annales de la Société royale malacologique de Belgique. Mollusks; Zoology. Fig. 11. — Coupe transversale d'un embryon de Chiton, passant par le vélum, X 200; d'après Kowalevsky. I, œsophage; II, cœ- lome; III, cordons nerveux; IV, partie antérieure de la cavité buccale; V, méso- derme ; VI, cellules ectodermiques du voile ; VII, endoderme (estomac). dermiques s'étendent entre l'endoderme et l'ectoderme, pour former le revêtement intérieur de cette cavité circulatoire; par spécialisation, ces éléments peuvent remplir presque complètement le reste du blastocèle, sous forme d'un faux mésencliym
. Bollettino del Laboratorio di zoologia generale e agraria della R. Scuola superiore d'agricoltura in Portici. Zoology; Zoology, Economic; Entomology. â 312 anteriore dell'embrione (Tav. VII, fig. 60). Dietro a tale introfles- sione l'entodertna, che è già molto vacuolizzato, si fende e la fenditura si pone anche in relazione col residuo del blastocele (Tav. VII, fìg. 69-71). Si forma cosi una cavità entoderraica in comunicazione coll'esterno per mezzo di un breve infudibolo ecto- dermico. Nella cavità (Tav. VII, fig. 71) si vede, fin dal primo. 1 2 3 Fis. VT. 1. Sezione sasittale siibniedi Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/bollettino-del-laboratorio-di-zoologia-generale-e-agraria-della-r-scuola-superiore-dagricoltura-in-portici-zoology-zoology-economic-entomology-312-anteriore-dellembrione-tav-vii-fig-60-dietro-a-tale-introfles-sione-lentodertna-che-gi-molto-vacuolizzato-si-fende-e-la-fenditura-si-pone-anche-in-relazione-col-residuo-del-blastocele-tav-vii-fg-69-71-si-forma-cosi-una-cavit-entoderraica-in-comunicazione-collesterno-per-mezzo-di-un-breve-infudibolo-ecto-dermico-nella-cavit-tav-vii-fig-71-si-vede-fin-dal-primo-1-2-3-fis-vt-1-sezione-sasittale-siibniedi-image234499276.htmlRMRHEA64–. Bollettino del Laboratorio di zoologia generale e agraria della R. Scuola superiore d'agricoltura in Portici. Zoology; Zoology, Economic; Entomology. â 312 anteriore dell'embrione (Tav. VII, fig. 60). Dietro a tale introfles- sione l'entodertna, che è già molto vacuolizzato, si fende e la fenditura si pone anche in relazione col residuo del blastocele (Tav. VII, fìg. 69-71). Si forma cosi una cavità entoderraica in comunicazione coll'esterno per mezzo di un breve infudibolo ecto- dermico. Nella cavità (Tav. VII, fig. 71) si vede, fin dal primo. 1 2 3 Fis. VT. 1. Sezione sasittale siibniedi
