File:Hertig1946b fig16.jpg

Fig. 16. The Yolk-Sac at Term

A. A drawing, about half-size, of a placenta and a portion of its attached amnion. The yolk-sac, lying between the amnion and chorion, is seen as a pyriform mass attached to the base of the umbilical cord by a thin stalk. (Fig. 32 from Cullen’s “The Umbilicus and Its Diseases,” W. B. Saunders Company.)

B. A photograph of a portion of the fetal surface of a normal mature placenta showing the characteristic tiny yellow opaque yolk-sac. The latter may lie anywhere within the obliterated chorionic cavity although it often lies fairly near the umbilical cord as shown in Fig. A. Actually this specimen lay near the margin of the placenta—some distance from the cord’s insertion. B. L-i. H., Pathological Laboratory.

C. A section of yolk-sac at term showing the {characteristic calcified mass surrounded by dense (fibrous tissue and lying between the amnion ? (above) and the chorion (below). B. L-i. H., E Pathological Laboratory, X60.

References

Hertig AT. lnvolution of tissues in fetal life: a review. (1946) Anat. Rec. 94: 96-116.

Cite this page: Hill, M.A. (2024, April 27) Embryology Hertig1946b fig16.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Hertig1946b_fig16.jpg

What Links Here?

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