File:Hertig1945d fig01.jpg

From Embryology

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Fig. 1. The middle cross section of an ovum not over 7.5 days of age

Above the somewhat eccentrically placed germ-disk is a barely discernible cleft—the amniotic cavity. Above the latter are a few dark, flattened amniogenic cells de-lamiznating in situ from the adjacent trophoblast. Toward the left of the chorionic cavity, a few primitive mesoblastic cells are seen which likewise arise from trophoblast by in situ delamination. Carnegie No. 8225, section 20-5-5, X 300 (minus).


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 22) Embryology Hertig1945d fig01.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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