File:Vertebrates Transverse sections through the germshield of a higher Vertebrate, showing the origin of the tubular from the bent germ-layerrudimentary.jpg

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Description FIG. 93. — Three diagrammatic transverse sections through the germshield of a higher Vertebrate, showing the origin of the tubular rudimentary organs from the bent germ-layers. In Fig. A the spinal tube (n) and the intestinal tube (a) are still open trenches ; the primitive kidneys (u) are still simple skin-glands. In Fig. B the spinal tube (n) and the dorsal wall have already closed, while the intestinal tube (a) and the ventral wall are still open ; the primitive kidneys are pinched off. In Fig. C both the spinal tube with the dorsal wall above, and the intestinal tube with the ventral wall below, are closed. All the open trenches have become closed tubes ; the primitive kidneys have penetrated into the interior. In all three figures the letters indicate the same parts ; h, skin-sensory layer ; n, spinal tube, or medullary tube ; u, primitive kidneys ; x, notochord; s, vertebral rudiments; r, dorsal wall ; b, ventral wall ; c, body-cavity (coeloma) ; f, intestinal-fibrous layer : t, primitive artery (aorta) ; v, primitive vein (intestinal vein) ; d, intestinal-glandular layer ; a, intestinal tube. (Cf. Plates IV. and V.)
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Source https://archive.org/details/cu31924024561114/page/309/mode/1up?view=theater&q=240 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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current11:05, 17 March 2024Thumbnail for version as of 11:05, 17 March 20241,515 × 689 (663 KB)Rasbak (talk | contribs)
01:15, 17 March 2024Thumbnail for version as of 01:15, 17 March 20241,515 × 689 (666 KB)Rasbak (talk | contribs){{Information |description=FIG. 93. — Three diagrammatic transverse sections through the germshield of a higher Vertebrate, showing the origin of the tubular rudimentary organs from the bent germ-layers. In Fig. A the spinal tube (n) and the intestinal tube (a) are still open trenches ; the primitive kidneys (u) are still simple skin-glands. In Fig. B the spinal tube (n) and the dorsal wall have already closed, while the intestinal tube (a) and the ventral wall are still open ; the primitive...

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