File:The evolution of man- a popular exposition of the principal points of human ontogeny and phylogeny (1920) (14760848311).jpg
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DescriptionThe evolution of man- a popular exposition of the principal points of human ontogeny and phylogeny (1920) (14760848311).jpg |
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Identifier: cu31924024561114 (find matches) Before image: EXPLANATION OF PLATES II AND III. EGG-CLEAVAGE AND GASTRULATION.78 These two plates are intended to illustrate, by means of diagrammatig sections, the most important differences in animal egg cleavage and gastrulation. Plate II. represents holoblastic eggs (with total cleavage) ; Plate III. meroblastic eggs (with partial cleavage). The animal halves of the eggs (exoderm) are coloured gray; the vegetative halves (entoderm with - putritive yelk) red. The nutritive yelk is perpendicularly shaded. All the sections are perpendicular meridian sections through the axis of the primi- tive intestine. In all, the letters indicate the same parts: c, parent-eell (Cytula); f, cleavage-cells (Segmentella); m, mulberry-germ (Morula) ; b, germ.-vesicle (Blastula) ; g, cup-germ (Gastrula); 8, cleavage-cavity; d, primitive intestinal cavity; o, primitive mouth; n, nutritive yelk; 4, intes- tinal layer (Entoderm) ; e, skin-layer (Exoderm). Fig, 1-6.—Original or primordial egg-cleavage of the lowest Vertebrate (Amphioxus). Fig. 1, parent-cell (Cytula); Fig. 2, cleavage-stage with 4 cleavage-cells; Fig. 3, mulberry-germ (Morula); Fig. 4, germ-vesicle (Blastula); Fig. 5, the same, in process of inversion (Invaginatio) ; Fig. 6, Rell-gastrula (Archigastrula). Fie, 7-11.—Unequal egg-cleavage of an amphibian (Frog). Fig. 7, parent-cell (Cytula); Fig. 8, cleavage-stage with 4 cleavage-cells; Fig. 9, mulberry-germ (Morula) ; Fig. 10, germ-vesicle (Blastula); Fig. 11, Hood. gastrula (Amphigastrula). Fie. 12-17.—Unequal egg-cleavage of a Mammal (Man). Fig. 12, parent-cell (Cytula); Fig. 13, cleavage-stage with 2 cleavage-cells (e, mother-cell of the exoderm; i, mother-cell of the entoderm; Fig. 14, cleavage stage with 4 cleavage-cells; Fig. 15, beginning of the inver sion of the germ-vesicle ; Fig. 16, further advanced inversion ; Fig. 17, Hood- gastrula (Amphigastrula). |
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Author | Internet Archive Book Images |
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Flickr posted date InfoField | 28 July 2014 |
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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14760848311. It was reviewed on 20 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions. |
20 September 2015
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current | 18:38, 16 March 2024 | 909 × 1,445 (1.87 MB) | Rasbak (talk | contribs) | ||
02:35, 20 September 2015 | 1,104 × 1,786 (332 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': cu31924024561114 ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fcu31924024561114%2F f... |
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