File:Hertig1956 fig17.jpg

Fig. 17. 9-day specimens of Horizon Vb

Detail of the embryo, chorionic cavity and adjacent trophoblast. Note lensshaped germ disc, amniogenesis from adjacent eytotrophoblast, and delaminating mesoblasts at the abembryonic pole which are continuous with the endoderm and thus together form the exocoelomic membrane. Carnegie Embryo 8215, Section 12-54. X 300.

Three 9-day specimens of Horizon Vb, characterized by syncytiotrophoblastic lacunae with early utero-placental circulation, amniogenesis, a simple bilaminar germ disc and only variable degrees of exocoelomie (Heuser’s) membrane formation.

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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 fig17.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig17.jpg

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