File:Umbilical Region in a Human Embryo 12 cm. in Length.jpg

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Description 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 exocoelom 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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Source https://archive.org/details/embryologyanatom00cull/page/20/mode/2up Embryology, anatomy, and diseases of the umbilicus : together with diseases of the urachus
Author Cullen, Thomas Stephen, 1868-1953

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current09:32, 18 February 2024Thumbnail for version as of 09:32, 18 February 2024707 × 707 (585 KB)Rasbak (talk | contribs){{Information |description=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...

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