File:Cullen1916 fig19.jpg

Fig. 19. Intra-abdominal View of the Umbilical Region in a Human Embryo 10 cm in Length

(X 6.)

The urachus is very narrow, but is continued out into the cord (allantois). In this cross-section of the cord it was recognized as a nest of polygonal cells devoid of a lumen, and surrounded by several bundles of well-defined non-striped muscle. This muscle surrounded the urachus down to, and merged into, that of the bladder. The umbilical ring is completely sealed over by a broad connective-tissue band. In the cross-section of the cord no remnants of the exocoelomic cavity were demonstrable, but in its place were traces of blood-vessels, evidently remains of the omphalomesenteric vessels.

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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 27) Embryology Cullen1916 fig19.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig19.jpg

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