File:Hertig1956 fig55.jpg

Fig. 55. Reconstruction of half an 8-day ovum

Viewed from the level of the greatest diameter of the embryo. The top section of the reconstruction coincides with the photomicrograph of this ovum in figure 13. The trophoblast (stippled) is still solid and is encircling the tips of maternal siuusoids which, although prominent, actually contain very little blood. The large sinusoid toward the right is interpreted as venous in type, whereas the coiled smaller one to the left is a spiral arteriole. The existing capillary anastomoses between this endometrial arteriole and vcnule are the structures that actually grow and dilate under the stimulus of the immediately adjacent trophoblast. Note amniotic cavity but lack of amnioblasts. dorsally concave hilaminar germ disc and mesoblasts within the chorionic cavity. See figures 13 and 14. Carnegie 8155. X 200.

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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 fig55.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1956_fig55.jpg

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