subcardinal vein

subcardinal vein

[¦səb′kärd·nəl ′vān]
(vertebrate zoology)
Either of a pair of longitudinal veins of the mammalian embryo or the adult of some lower vertebrates which partly replace the postcardinals in the abdominal region, ventromedial to the mesonephros.
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References in periodicals archive ?
The paired subcardinal veins are the next to appear with the right subcardinal vein forming the suprarenal segment of IVC and the left subcardinal system regressing.
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.
The one described by Shulman in 1997, which states the persistence of the subcardinal vein as IVC, seems to be the most accepted one [16].
The right subcardinal vein develops into the suprarenal segment by subcardinal-hepatic anastomoses.
The supra-renal segment develops from the right subcardinal vein and the infra-renal segment develops from the right supracardinal vein.
The middle segment joins with part of the right subcardinal vein to form the renal portion of the IVC.
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).
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].
The right subcardinal vein forms azygos vein and the left subcardinal vein forms hemiazygos vein.
a) the mesonephric vein draining into the left subcardinal vein, b) part of the left subcardinal vein c) communicating channels between the subcardinal veins.
The horizontal segment crossing anterior to the kidney can be assumed to be the persisting left post-subcardinal anastomosis connecting the posterior cardinal vein with the subcardinal vein anterior to the mesonephros.