File:Aves Three stages of the blastoderm to show the extension of the mesoblast.jpg

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Fig. 44. — Three stages of the blastoderm to show the extension of the mesoblast.
A. Before formation of the head-process.
B. The head-process is formed; the head fold in process of formation.
C. Later stage shortly before the appearance of the first intersomitic groove.

A. C. V., Amnio-cardiac vesicle. a. o. Area opaca. a. p.. Area peducida. a. vase. Area vasculosa. a. ve i, Area vitellina interna. BL. T., Blood island. H. F., Head-fold. H. pr. Head-process, — Med. pl. Medullary plate. M. M., Margin of the mesoblast. pr’a., Proamnion. — pr. f., Primitive fold. pr. gr., Primitive groove. pr. kn. Primitive knot. pr. p., Primitive pit. pr. pl, Primitive plate. pr. str, Primitive streak. S. t., Sinus terminalis.
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Source https://archive.org/details/developmentofchi00lill/page/88/mode/1up?view=theater The development of the chick; an introduction to embryology. NEW YORK HENRY HOLT AND COMPANY 1908
Author Lillie, Frank Rattray

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[[Category:Blastoderm]

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current09:53, 11 April 2024Thumbnail for version as of 09:53, 11 April 20241,486 × 626 (885 KB)Rasbak (talk | contribs){{information |description=Vig. 44. — Three stages of the blastoderm to show the extension of the mesoblast.<br> A. Before formation of the head-process.<br> B. The head-process is formed; the head fold) in process of formation.<br> C. Later stage shortly before the appearance of the first intersomitic groove.<br> A. C. V., Amnio-cardiac vesicle. a. o. Area opaca. a. p.. Area peducida. a. vase. Area vasculosa. a. ve i, Area vitellina interna. BL. T., Blood island. H. F., Head-fold. H. pr. Hea...

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