File:Cullen1916 fig23.jpg

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Fig. 23. Cross-section of the Umbilical Cord at the Umbilicus in a Human Embryo 12 cm in Length

(X 8.)

This drawing is also from the embryo shown in Fig. 22 In the upper figure the cord has been cut across about 1 mm from the abdominal wall. The umbilical arteries are surrounded by Wharton's jelly. In the triangle below and between them is a small, opaque cord, the allantois. Above the right umbilical artery an irregular lumen, continued as a slit on either side, represents the disappearing exocoelomic cavity. The slit-like portion above the vein is already partially organized. Surrounding the entire mass is a dense layer of connective tissue, and external to this is the subcutaneous adipose tissue traversed by numerous cutaneous vessels. The lower picture shows a microscopic section still nearer the embryo. The slit-like exocoelom (c, c) stands out much more clearly. In its upper wall are seen the omphalomesenteric vessels and duct. An enlarged view of these is given on the left. Here the omphalomesenteric duct is recognized as a solid nest of epithelial cells. The allantois is visible slightly below and between the umbilical arteries, whose lumina are star-shaped.

The drawing to the right shows that the allantois is patent and surrounded by polygonal cells. The allantois here is inclosed in embryonic connective tissue which is devoid of muscle.

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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


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 23) Embryology Cullen1916 fig23.jpg. Retrieved from

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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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