File:Hertig1956 fig24-25.jpg

Fig. 24-25. Normal Ovum 11-day

Three normal, late previllous ova 11 to 12 days old, of Horizon Vc. characterized by intereommunieating laeunar spaces filled with maternal plasma containing still increasing numbers of blood cells, a distended chorionic. cavity, an execoelomic cavity of maximum size, a bilaminar germ disc and well~defined amnion and amniotic cavity. Details of the germ discs of these ova are shown on plate 6.

24 Surface view of an intact 11-day implantation site showing wrinkling of endometrium between and at the gland mouths. From the endometrial defect created by the ovum arises a coagulum which communicates with maternal blood within the lacunae. Carnegie 7699, Sequence 8. X 22.

25 A medium-power view of a mid-cross section of the ovum shown in figure 24. Note that the endometrial epithelium is proliferating to repair the penetration defect. The cytotrophoblast, immediately surrounding the chorionic cavity, gives rise, by peripheral proliferation and differentiation, to irregular masses which grow into and become invested by syncytiotrophoblast, thus constituting the primordia of chorionic villi. Note syncytium surrounding an endometrial gland and maternal white blood cells in the lacunae. Carnegie 7699, Section 8-5-3. 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, April 27) Embryology Hertig1956 fig24-25.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig24-25.jpg

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