File:Cullen1916 fig15.jpg

Fig. 15. Sagittal View of a Graphic Reconstruction of the Umbilical Region of a Human Embryo 5.2 cm in Length

From within, the relations of the umbilical arteries to the vein are clearly seen. They surround the funnel-shaped remnant of the exoccelom. No trace of the omphalomesenteric vessels is to be seen in the peritoneal cavity, but in cross-sections of the cord near the embryo the lumen of the umbilical vein still persists, as indicated in the small drawing to the left. It is embedded in the wall of the exoccelom, but has no connection with any other vascular structure. The bladder bulges out between the umbilical arteries. The urachus (allantois) passes out into the cord between and below the umbilical arteries. This is the characteristic arrangement. The urachus shows two dilatations.

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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 fig15.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig15.jpg

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