Uberon definition : Either of a pair of large transverse venous sinuses that conduct blood from the cardinal
veins to the sinus venosus of the vertebrate embryo[BTO].;
Uberon related term : future coronary sinus; Cuvierian duct; duct of Cuvier;
Uberon Homology note : In primitive vertebrates, the basic early embryonic pattern is retained, and blood
from anterior and posterior systemic tissues is returned in anterior and posterior
cardinal veins, both pairs of veins uniting in common cardinal veins near the heart.
In derived vertebrates, the cardinals appear but usually persist only in the embryo,
being functionally replaced by alternative adult vessels, the precava and postcava
(anterior and posterior venae cavae).[well established][VHOG];
Uberon Taxon note : Paired in gnathostomes; with only a vestige of the right duct in the adult hagfish
(21) and the left duct atrophying at metamorphosis in the lamprey (22)[PMID:20959416,
S1];