File:Hertig1956 fig26-27.jpg

Fig. 26-27.

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.

26 Surface view of an intact 12-day-ovum, transilluminated after clearing, showing ehorionic cavity as a dark central area with surrounding opaque but vaeuolated trophoblast. Note wrinkled endometrial surface with gland months evident as dark pits. Carnegie 7950, Sequence 10. X 22.

27 A medium-power view of a mid-cross section of the ovum shown in figure 26. The edema of the endometrinm, though variable, is characteristic of specimens of this general age. Note the distended exocoelomic cavity, the coalesced lacunar spaces showing evidence of an early utero~placental circulation and the budding of the cytotrophoblast to form primordia. of villi. The penetration defect has not been completely healed. Note the cross-section of a gland at the left margin of the ovum. Carnegie 7950, Section ll-5-2. 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 19) Embryology Hertig1956 fig26-27.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig26-27.jpg

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