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From Embryology

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Scheme showing early stages of development of the inferior vena cava

Inferior Vena Cava

The development of the inferior vena cava is associated with the formation of two veins, the subcardinal veins (Figs. 477, 478). These lie parallel to, and on the ventral aspect of, the cardinal veins, and originate as longitudinal anastomosing channels which link up the tributaries from the mesentery to the cardinal veins; they communicate with the cardinal veins above and below, and also by a series of transverse branches. The two subcardinals are for a time connected with each other in front of the aorta by cross branches, but these disappear and are replaced by a single transverse channel at the level where the renal veins join the cardinals, and at the same level a cross communication is established on either side between the cardinal and subcardinal (Fig. 478). The portion of the right subcardinal behind this cross communication disappears, while that in front, i.e., the prerenal part, forms a connection with the ductus venosus at the point of opening of the hepatic veins, and, rapidly enlarging, receives the blood from the postrenal part of the right cardinal through the cross communication referred to. In this manner a single trunk, the inferior vena cava (Fig. 480), is formed, and consists of the proximal part of the ductus venosus, the prerenal part of the right subcardinal vein, the postrenal part of the right cardinal vein, and the cross branch which joins these two veins. The left subcardinal disappears, except the part immediately in front of the renal vein, which is retained as the left suprarenal vein. The spermatic (or ovarian) vein opens into the postrenal part of the corresponding cardinal vein. This portion of the right cardinal, as already explained, forms the lower part of the inferior vena cava, so that the right spermatic opens directly into that vessel. The postrenal segment of the left cardinal disappears, with the exception of the portion between the spermatic and renal vein, which is retained as the terminal part of the left spermatic vein.


Venous Links: early parietal veins | inferior vena cava | jugular and cardinal cross branches | completed parietal veins




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Reference

Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.


Cite this page: Hill, M.A. (2024, May 23) Embryology Gray0478.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0478.jpg

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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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