File:Hertig1956 fig44.jpg

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Fig. 44.

Three ova of Horizon VI about 13 days of age cliaraeterized by primitive villi and a distinct yolk-sac. Low power views of mid sections of each of these ova are shown on plate 8.


44 A medium-power view of a mid~cross section of the ovum shown in figure 43. Note that the eetoderm laterally has a dorsally curved margin and that the yolk-sac is double-layered. The stulJb_v, unbranched primitive villi have formed about the entire periphery of the chorion and contain extraembryonic mesoblast or primitive fibroblastic tissue. The peripheral tips of these villi will extend outwardly to the endometrium and, as they coalesce at the placental floor, form the anchorage for the developing ovum. Axial differentiation is just appearing in this embryo. The primordium of the primitive streak and a few cells of body mcsoderm are found in sections more cnudad than the one illustrated. Carnegie 7801, Section 12-1-1. X 100.


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Reference

Hertig AT. Rock J. and Adams EC. A description of 34 human ova within the first 17 days of development. (1956) Amer. J Anat., 98:435-493.


Cite this page: Hill, M.A. (2024, May 24) Embryology Hertig1956 fig44.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig44.jpg

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