File:Mammals The separation of the discoidal germ from the yolk-sac, seen in section.jpg
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[edit]DescriptionMammals The separation of the discoidal germ from the yolk-sac, seen in section.jpg |
Fig. 100.--The separation of the discoidal mammalian germ from the yelk-sac, seen in section (diagrammatic). A. The germ-disc (h, hf) lies extended on one side of the intestinalgerm-vesicle (4b). B. In the centre of the germ-disc the medullary furrow (mr), and under that the notochord (ch) appear. C. The intestinal-fibrous layer (df) has growm round the intestinal-glandular layer (dd). D. Skin-fibrous layer (hf) and intestinal-fibrous layer (df) part round the circumference of the germ-disc ; the intestine (d) begins to separate itself from the yelk-sac or navel-vesicle (nb). E. The intestinal tube (mr) is closed; the body-cavity (c) begins to form. F. The primitive vertebrea (w) appear; the intestine (archenteron) (d) is almost completely closed. G. The primitive vertebrae (w) begin to grow round the medullary tube (mr) and the notochord (ch); the intestine (d) is separated from the navel-vesicle (nb). H. The vertebrae (w) have enclosed the medullary tube (mr) and the notochord (ch); the body-cavity (c) is closed ; the navel-vesicle has disappeared. The amnion and serous membranes are omitted. In all, the letters indicate the same parts: h, horn-plate ; mr, medullary tube ; hf, skin-fibrous layer; w, primitive vertebrae; ch, notochord; c, body-cavity; df, intestinal-fibrons layer; dd, intestinal-glandular layer; d, intestinal cavity ; nb, navel-vesicle. |
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Source | https://archive.org/details/cu31924024561114/page/333/mode/1up?view=theater&q=Frontiapiece The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. Appleton New York |
Author | Haeckel, Ernst Heinrich Philipp August |
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current | 21:27, 17 March 2024 | ![]() | 1,151 × 811 (590 KB) | Rasbak (talk | contribs) | {{Information |description=Fig. 100.--The separation of the discoidal mammalian germ from the yelk-sac, seen in section (diagrammatic). A. The germ-disc (h, hf) lies extended on one side of the intestinalgerm-vesicle (4b). B. In the centre of the germ-disc the medullary furrow (mr), and under that the notochord (ch) appear. C. The intestinal-fibrous layer (df) has growm round the intestinal-glandular layer (dd). D. Skin-fibrous layer (hf) and intestinal-fibrous layer (df) part round the circu... |
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