part of part of tributary of tributary of Homo sapiens system axillary vein subclavian vein lateral thoracic vein http://upload.wikimedia.org/wikipedia/commons/e/e9/Gray576.png UBERON:0002088 MA:0002162 EMAPA:37163 FMA:71210 The lateral thoracic vein is a tributary of the axillary vein. It runs with the lateral thoracic artery and drains the serratus ventralis muscle and the Pectoralis major muscle. Normally, the thoracoepigastric vein exists between this vein and superficial epigastric vein (a tributary of femoral vein), to act as a shunt for blood if the portal system (through the liver) develops hypertension or a blockage. [WP,unvetted]. vena thoracica lateralis Wikipedia:Lateral_thoracic_vein SCTID:53595001 thoracic vein