File:Cullen1916 fig21.jpg

Fig. 21. Intra-abdominal View of the Umbilical Region in a Human Embryo 12 cm in Length

(X 3.)

The urachus gradually narrows, but microscopically could be traced as a cord for a considerable distance out into the umbilical cord. In the main it was solid, but here and there appeared to have a lumen. The umbilical vessels now have very well-developed muscular coats, the inner longitudinal layer being especially thick. The umbilical ring shows a puckering, possibly due to the hardening. It is obliterated. Note the oval, funnel-shaped depression between the umbilical arteries and vein. Adherent to the bottom of this is a cord which was attached to a loop of small bowel. This is the remnant of the omphalomesenteric duct or vessels. In the cord the exoccelom is recognized as a slit-like cavity traversed by delicate trabecular of young connective tissue. At one side of this slit is a dense mass of tissue containing the patent omphalomesenteric vessels, and the duct which appeared as a mass of epithelial cells but showed no lumen.

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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. (2024, April 16) Embryology Cullen1916 fig21.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig21.jpg

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