File:Blyakher1955 fig08-10.jpg

Figs. 8-10. Illustrations of Wolff's work "Single egg carrying twins"

8. Egg extracted from the shell; a - albumin; b- yolk; c - the part of the terminal vein; d - the part of the yolk which is devoid of vessels; e - area vasculosa; f , g- - upper and lower embryo; h - the part of the umbilical vesicle of the upper embryo; i - a depression in the yolk which is produced by this vesicle; k, m - umbilical vesicle of the upper and lower embryos; n, o - folds of the yolk membrane; P/ <lr r - yolk vessels of the upper embryo; t, u, v- the same vessels of the lower embryo.

9. The part of the membrane adjacent to the embryo, from the internal aspects; a - border of the cut membranes; b, c - upper and lower embryos ; d , e - folds of the membranes ; f, o - openings of the intestinal canal of the upper and lower embryos; p, q - border of the abdominal umbilical opening which is transparent throughout the membranes; h, i, k, m, n- - yolk vessels of the upper embryo; r - same vessels of the lower embryo.

10. Internal surface of the external membranes which is seen after being separated and turned internally; a - external yolk membrane; b, c - lower and upper embryos; d, e - part of the internal membrane which extends into the intestines of both embryos; f, g - their umbilical bladders; h - opening of the umbilicus through which the internal yolk membrane, which is a continuation of the intestine, leads out from the abdomen; k- vessels; 1, m - folds of the membranes .

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Figures: 1 Arnold van der Hulst | 2 Kaspar Friedrich Wolff | Wolff's chicken development

Reference

Blyakher L. History of embryology in Russia from the middle of the eighteenth to the middle of the nineteenth century (istoryia embriologii v Rossii s serediny XVIII do serediny XIX veka) (1955) Academy of Sciences USSR. Institute of the History of Science and Technology. Translation Smithsonian Institution (1982).

Cite this page: Hill, M.A. (2024, April 25) Embryology Blyakher1955 fig08-10.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Blyakher1955_fig08-10.jpg

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