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Fig. 16. A maid-cross section of the embryo and adjacent chorion of a 14-day ovum

The amniotic cavity is now a flattened cone and is completely enclosed by the thin amniotic membrane above and the primitive ectoderm below. The yolk-sac has now appeared and has already outstripped the amniotic cavity in size although the former has probably not been present for more than 36 ours.

Carnegie 7801, section 12-1-3, X 100.


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, May 20) Embryology Hertig1945d fig16.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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