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Fig. 5. Sagittal View of a Human Embryo 5 mm. in Length

In large part the left halves of the amnion and embryo have been removed, in order to bring clearly into view the structure of the cord. The expanding amnion has almost reached the chorion, hence but little remains of the extra-amniotic portion of the yolk-stalk and of the body-stalk. The umbilical cord has become longer. The caudal portion of the cord is firm and contains the umbilical arteries and veins; the latter, soon pfter leaving the body, form a common trunk, which usually curves toward the left. Between the two umbilical arteries lies the allantois, the bulbous end of which still persists almost to the amnion. The cranial portion of the cord is looser in texture. It contains the ccelomic cavity, in which lies the omphalomesenteric duct, accompanied by its vessels. Note that the superior mesenteric vein empties into the omphalomesenteric vein behind the pancreatic buds. The omphalomesenteric artery still arises by several branches from the aorta.

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, June 18) Embryology Cullen1916 fig05.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig05.jpg

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