File:Hertig1956 fig11-12.jpg

Fig. 11 - 12. implanted ovum 7 days

Three normal, previllous ova, Streeter Horizon Va, possessing solid syncytioand cytotrophoblast without. lacunar development, an amniotic cavity and/or an early amnion, a simple hilaminar germ disc and early mcsoblast formation.

11 Another recently implanted ovum, also not more than 7 days of age in view of critical dating of coitus, hut interpreted as being slightly older than 8225 hecause of germ-disc. development. and greater trophoblastic maturity. Note greatest concentration of dark syncytiotrophoblast in the center of the implantation pole dorsal to the embryo. The lighter cytotrophoblast is most prominent peripherally but also lines the inner surface of the proliferating trophoblast. It is amniogenic at its area of contact with the embryo. The nuclei of the surface endomctrial epithelium at its contact with the trophoblast show the abnormality of hydropic degeneration. These might be mistaken for nuclei of syneytiotrophoblastic origin. Actually some of the smaller denser nuclei of the syncytiotrophoblast appear to he of cndometrial stromal origin through the process of ingestion. Carnegie Embryo 8020, Section 6-5-9. X 300.

12 Surface view of the same 7-day ovum seen in figure 1. Note clearly visible embryonic mass within dark chorionic cavity which is surrounded by an opaque zone of trophoblast folded at the equatorial plane of the ovum. Carnegie Embryo 8020, Sequence 6. X 22.

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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 fig11-12.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig11-12.jpg

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