File:Hertig1956 fig13-14.jpg

Fig. 13-14.

11-16 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.

13 An ovum, probably about 8 days of age. Although coital data for this specimen are not critical, its development places it between the 7- and 9-day stages on which critical coital data are available. This inconspicuous stage of implantation is characterized by nearly complete nidation, solid but festooned trophoblast, a small ehorionic. cavity containing a few mesoblasts and a dorsally concave germ disc. Although the primordium of the amniotic cavity is prominent there appears, as yet, to be no amniogencsis. Note actively invading prongs of syncytiotrophoblast surrounding an area of endomctrial stroma and containing two distinct types of nuclei. The large ones divide amitotically but at least some of the smaller ones appear to be of cndometrial stromal origin suggested by the indistinct zone of demarcation between the trophoblast and the maternal stroma. Carnegie Embryo 8155, Section 4-4-8. X 300.

14 Surface view of intact ovum shown in figure 13. Note the inconspicuous nature of the slightly raised but opaque implantation site. Carnegie Embryo 8155, Sequence 8. 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 fig13-14.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig13-14.jpg

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