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Fig. 5. A human ovum of approximately 16.5 days of age

A. A human ovum of approximately 16.5 days of age. The chorionic villi are still simple, unbranched structures. The chorionic cavity contains a normally-situated embryo, the details of which are seen in fig. 5B. No trace of the exocoelomic membrane remains. Carnegie 7802, section 44-3-5, X30.

B. Section through embryo of 16.5 day human ovum. Note double-layered yolk-sac (YS) above and amniotic cavity (AC) below the embryonic disk. The amnion is lightly attached by mesoblastic tissue to the chorionic membrane whose simple villi are continuous with their trophoblastic cell columns. The latter are continuous with the surrounding endometrium although this feature is not seen in this picture. Carnegie 7802, section 44-3-5, X100.


Hertig AT. lnvolution of tissues in fetal life: a review. (1946) Anat. Rec. 94: 96-116.

Cite this page: Hill, M.A. (2024, June 22) Embryology Hertig1946b fig05.jpg. Retrieved from

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