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==Fig. 4. A Diagrammatic Representation of a Human Embryo, about 3.5 mm. Long==


Showing the Effect of the Expanding Amnion upon the Yolk-sac and Body-stalk.
The amnion has now completely encircled the embryo, and with its increase in size has crowded the yolk-sac
away. Outside the amnion the yolk-sac and body-stalk are separate structures; inside the amniotic ring they are fused,
forming the umbilical cord. The amnion covers the cord as far as the embryo. It is probable that the tension produced on the yolk-Stalk by the amnion contributes to the primitive kink in the alimentary canal.
===Reference===
{{Ref-Cullen1916}}
{{Footer}}

Revision as of 17:24, 27 October 2018

Fig. 4. A Diagrammatic Representation of a Human Embryo, about 3.5 mm. Long

Showing the Effect of the Expanding Amnion upon the Yolk-sac and Body-stalk.

The amnion has now completely encircled the embryo, and with its increase in size has crowded the yolk-sac away. Outside the amnion the yolk-sac and body-stalk are separate structures; inside the amniotic ring they are fused, forming the umbilical cord. The amnion covers the cord as far as the embryo. It is probable that the tension produced on the yolk-Stalk by the amnion contributes to the primitive kink in the alimentary canal.

Reference

Cullen TS. Embryology, anatomy, and diseases of the umbilicus together with diseases of the urachus. (1916) W. B. Saunders Company, Philadelphia And London.

Cite this page: Hill, M.A. (2026, October 30) Embryology Cullen1916 fig04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig04.jpg

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© Dr Mark Hill 2026, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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