part of part of develops from develops from tributary of tributary of Homo sapiens azygos vein vein hemiazygos vein http://upload.wikimedia.org/wikipedia/commons/3/3e/Gray480.png The hemiazygos vein (vena azygos minor inferior) is a vein running superiorly in the lower thoracic region, just to the left side of the vertebral column. Wikipedia:Hemiazygos_vein UBERON:0006663 EHDAA2:0004534 SCTID:244408009 hemi-azygos vein hemiazygous vein The major anatomic variation between the pig and other mammalian species is the presence of the large left azygos vein, which enters the coronary sinus (Fig. 1). In other mammals, hemiazygos vein enters the pre- cava. hemiazygous vein inferior hemi-azygos vein hemiazygos FMA:4944 vena hemiazygos hemiazygos veins EMAPA:18251 left supracardinal vein