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Fig. 81. Abnormal Ova

Two abnormal ova showing malposition of the germ disc and, in one of the specimens, shallow implantation. Whether these ova would ultimately have aborted it is impossible to say.

A low-power view of a section of an abnormal 13-day villous ovum showing shallow implantation and malorientation of the germ disc. Note polypoid type of implantation which may have resulted from failure of proper trophoblastic development at the embryonic pole. The polypoid protrusion may have caused mechanical pressure from the opposite wall of the uterus resulting in distortion of the chorionic. cavity with consequent buckling of the germ disc. This feature is shown in detail in figure 86. Carnegie 8290, Section 25-2-4. X 20.


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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, June 14) Embryology Hertig1956 fig84.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig84.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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