File:Hertig1946b fig04.jpg

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Fig. 4. A human ovum of approximately 13.5 days of age

A. The hemorrhagic closing cap is seen above the ovum. The chorion possesses simple unbranched villi. The chorionic cavity contains an eccentrically situated embryo (see fig. 4B for details of the latter) and the remnants of the exocoelomic membrane (EX. M). The endometrium shows an early decidual reaction about the'ovum. The gland below the ovum contains extravasated blood. Note large sinusoid in the endometrium to the left of the ovum. Carnegie 7801, section 12-1-1, X35.

B. Section through embryo of 13.5 day human ovum. Note the single-layered yolk-sac (YS) to the left of the embryonic disk and the amniotic caivity (AC) to the right. Note early connective tissue in base of simple chorionic villi. The blood at-the right is within the intervillous space of the early placenta. Carnegie 7801, section 12-1-3, X100.


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

Cite this page: Hill, M.A. (2024, May 22) Embryology Hertig1946b fig04.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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