File:Hertig1945d fig07.jpg

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Fig. 7. A mid-cross section of an ovum 8 to 9 days of age

Note that the amniotic cavity is no more advanced than is that of the younger specimen seen in ii . 6, although there are several amniogenic cells arising from the adjacent trophoblast in the ol er specimen. Likewise, mesoblastic formation is more advanced, as shown by the presence of an early exocoelomic membrane. In places the mesoblastic cells of the latter are still attached to the trophoblast from which they appear to be originating. Carnegie 8171, section 3-2-12, X 300.


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 21) Embryology Hertig1945d fig07.jpg. Retrieved from

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