drains drains internal iliac vein A vein that begins near the upper part of the greater sciatic foramen, passes upward behind and slightly medial to the hypogastric artery and, at the brim of the pelvis, joins with the external iliac to form the common iliac vein. [WP,unvetted]. EHDAA2:0000874 EMAPA:37148 FMA:18884 MA:0002139 MA:0002145 NCIT:C32847 UBERON:0001317 UMLS:C0226764 VHOG:0000749 galen:InternalIliacVein hypogastric vein uberon v. hypogastrica v. iliaca interna pelvic region element iliac vein