File:Hertig1956 fig20.jpg

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Fig. 20.

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.


20 Detail of embryo and surrounding trophoblast. Note bilaminar germ disc with vacuolated ectoderm, early amniogenesis and an early exoeoelomic membrane. delaminating from the cytotrophoblast, best seen at the abembryonic pole. Note small shallow surface ulcer with alteration of adjacent nuclei. The paler cytotrophoblast lines the chorionie cavity and varies in thickness whereas the darker synrcytiotrophoblast lies peripherally and contains many intracytoplasmic lacunae which are coalescing to form the future intcrvillous space. Note mitotic figure in cytotrophoblast. Carnegie 8171, Section 3-:2-11. X 300.


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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, May 24) Embryology Hertig1956 fig20.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig20.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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