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Lying ventral to the anterior or posterior cardinal veins in the embryo.
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Under normal circumstances, the prerenal division of the IVC is formed following the union of the hepatic segment, which itself is a vitelline vein derivative, with the right subcardinal vein.
Su origen es controversial, se cree que se debe a una falla en la formacion de la anastomosis hepatico-subcardinal derecha, que lleva a atrofia de la vena subcardinal de este mismo lado [1,3].
Swaiman et al (6) suggested that due to the fact that supracardinal veins form last, the supra-renal and renal IVC may form normally from the subcardinal veins, and the infrarenal segment may not develop because of a later insult to the supracardinal veins.
The authors suggest the explanation for this varying pattern based on this step of the embryological development of the right renal vein: There was an error on the fusion of the branches to the dorsal mesonephros derived from the right postcardinal vein, the dorsal-medial branches of the right supracardinal vein and the ventral branches of the right subcardinal vein (the latter represented by the IRRV, marked by the presence of its gonadal tributary (Gillot).
In July 1990, four permanent transects were established in each of the nine patches, extending from the center to the edge of the patch along subcardinal directions (NE, NW, SW, and SE).
The plots included a center (C) position plus one plot equidistant from the center in all subcardinal directions (northwest [NW], northeast [NE], southwest [SW], southeast [SE]).
Right subcardinal vein (Prerenal segment) receives right suprarenal vein.
In particular, the postcardinal veins appear and remain in the pelvis as the common iliac veins, the right supracardinal vein persists to form the infrarenal IVC, and the right subcardinal vein persists to develop into the suprarenal segment by formation of the subcardinal-hepatic anastomosis while the left subcardinal vein and the left supracardinal vein regress completely [2, 4, 6].
7) It is postulated that the subcardinal and supracardinal system form extensive anastomotic channels at the level of the renal vein and that the persistence of one of these midline anastomoses could result in pelviureteric junction obstruction; however, the occurrence of these anomalies in a case of CDH has not been reported before.
INTRODUCTION: The azygos venous system develops in the basis of multiple transformations of the subcardinal veins, (1) which causes its great variability, especially on the left side.
a) the mesonephric vein draining into the left subcardinal vein, b) part of the left subcardinal vein c) communicating channels between the subcardinal veins.