File:Cullen1916 fig21.jpg

From Embryology

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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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Figure Links: 1 Human embryo 0.7 mm | 2 Human embryo 1.7 mm | 3 Human embryo 2.5 mm | 4 Human embryo 3.5 mm | 5 Human embryo 5 mm | 6 Human embryo 7 mm | 7 Human embryo 7 mm | 8 Human embryo 10 mm | 9 Human embryo 12.5 mm | 10 Human embryo 10 mm | 11 Human embryo 23 mm | 12 Human embryo 3 cm | 13 Human embryo 4.5 cm sagittal | 14 Human Embryo 4.5 cm | 15 Human Embryo 5.2 cm | 16 Human Embryo 6.5 cm | 17 Human Embryo 7.5 cm | 18 Human Embryo 9 cm | 19 Human Embryo 10 cm | 20 Human Embryo 12 cm | 21 Human Embryo 12 cm | 22 Human Embryo 12 cm | 23 Human Embryo 12 cm Cord | 28 Fetus Five Months | 30 Ventral Heria | 31 Human Embryo 5.5 cm | 32 Term Human | 33 Term Human | [[Figures


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, May 24) 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

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