drains posterior region of body posterior vena cava A vein that carries deoxygenated blood from the lower half of the body into the right atrium of the heart. AAO:0011083 BTO:0002682 EHDAA2:0000611 EMAPA:18416 FMA:10951 GAID:548 MA:0000480 MESH:D014682 Phylogenetic modifications within this basic pattern of arteries and veins are largely correlated with functional changes. In the transition from water to land, gills gave way to lungs, accompanied by the establishment of a pulmonary circulation. In some fishes and certainly in tetrapods, the cardinal veins become less involved in blood return. Instead, the composite, prominent postcava (posterior vena cava) arose to drain the posterior part of the body and the precava (anterior vena cava) developed to drain the anterior part of the body.[well established][VHOG] Trunk of systemic vein which is formed by the union of the right common iliac vein and the left common iliac vein and terminates in the right atrium[FMA]. UBERON:0001072 UMLS:C0042458 VHOG:0001194 XAO:0000388 caudal vena cava galen:InferiorVenaCava inferior caval vein inferior vena cava postcava posterior vena cava uberon vena cava inferior vena cava