File:Keibel Mall 2 574.jpg

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Fig. 574. Mesonephric veins of a human embryo of 9.5 mm greatest length

(Embryo Ma. 3, from the collection of Professor Hochstetter, Vienna.)

The veins have been reconstructed and drawn upon the model of the mesonephros.

The posterior cardinal vein develops horizontal branches arranged in two longitudinal rows, a medial and a lateral one. The branches of the medial row pass medially to the Malpighian corpuscles, those of the lateral row between the primary excretory duct and the coils of the tubules. At their ends most of the branches of both rows, especially in the caudal half of the mesonephros, develop ascending and descending branches, and portions of two longitudinal vessels are thus formed on either side, these vessels being the medial and lateral v. subcardinalis.

The posterior cardinal, the transverse branches, and the two subcardinals represent a very rudimentary mesonephric portal circulation.


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Felix W. The development of the urinogenital organs. In Keibel F. and Mall FP. Manual of Human Embryology II. (1912) J. B. Lippincott Company, Philadelphia. pp 752-979.

XIX Development of the Urinogenital Organs: Excretory Glands and their Ducts | Reproductive Glands and their Duct | Urogenital Union | External Genitalia | Figures | Literature
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Cite this page: Hill, M.A. (2024, April 16) Embryology Keibel Mall 2 574.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel_Mall_2_574.jpg

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