supracardinal veins


Also found in: Dictionary, Thesaurus, Medical.

supracardinal veins

[¦sü·prə′kärd·nəl ‚vānz]
(vertebrate zoology)
Paired longitudinal veins in the mammalian embryo and various adult lower vertebrates in the thoracic and abdominal regions, dorsolateral to and on the sides of the descending aorta; they replace the postcardinal and subcardinal veins.
References in periodicals archive ?
Finally, the infrarenal segment of the IVC seems to derive from the right supracardinal vein.
In the thoracic region, the supracardinal veins give rise to the azygos and hemiazygos veins.
The post-hepatic IVC develops between the sixth and eighth weeks of embryonic life as a composite structure formed from the continuous appearance and regression of three paired embryonic veins, the posterior cardinal, the subcardinal, and the supracardinal veins. The supra-renal segment develops from the right subcardinal vein and the infra-renal segment develops from the right supracardinal vein.
Duplication of the IVC is a rare anomaly of the infrarenal segment (due to persistence of the supracardinal veins), with an incidence of 0.2% to 3%.