File:Hertig1945d fig12.jpg

Fig. 12. A mid-cross section of a 12.5-day ovum

The amniotic cavity is a cleft-like space above the primitive ectoderm of the germ-disk. It is barely enclosed above by the amniogenic cells which are still arising, in places, from adjacent trophoblast: Details of this process, at higher magnification, are shown in figs. 14 and 15. The exocoelomic (Heuser’s) membrane has reached the high point of its development and is destined to disintegrate within the next few days. Its essential mesoblastic nature is shown by the character of its cells and by their attachment. in places, to the trophoblast from which they arose. Carnegie 7700, section 6-1-S, x 100.

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  Fig 10 Carnegie 7699

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  Fig 11 Carnegie 7699

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  Fig 12 Carnegie 7700

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  Fig 13 Carnegie 7700

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  Fig 14 Carnegie 7700

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  Fig 15 Carnegie 7700

Reference

Hertig AT. On the development of the amnion and exocoelomic membrane in the previllous human ovum. (1945) Yale J Biol Med. 18:107-15. PubMed 21007544

Cite this page: Hill, M.A. (2024, April 26) Embryology Hertig1945d fig12.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1945d_fig12.jpg

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