File:Cullen1916 fig18.jpg

Fig. 18. Intra-abdominal View of the Umbilical Region in a Human Embryo 9 cm in Length

(X 7.)

The urachus shows a spindle-shaped widening at its upper portion. Microscopically it could, however, be traced in its continuity not only to the umbilicus, but also out into the cord, as indicated by the cross-section of the cord, where it occupies its characteristic position in relation to the umbilical arteries. The umbilical ring is entirely bridged over by a band of subperitoneal connective tissue. A considerable space exists between the umbilical vein and the umbilical arteries. This arrangement closely resembles that noted in the adult. There is no trace of the omphalomesenteric structures in the cord.

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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, April 27) Embryology Cullen1916 fig18.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Cullen1916_fig18.jpg

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