part_of part of part of drains drains tributary of tributary of system urinary bladder internal iliac vein vein vesical vein http://upload.wikimedia.org/wikipedia/commons/b/bd/Gray585.png uberon MA:0002263 EMAPA:37205 Wikipedia:Vesical_veins A tributary of the iliac vein that drains the urinary bladder. UBERON:0002460 SCTID:12683000 vesical veins set