In human anatomy, the brachial veins are venae comitantes of the brachial artery in the arm proper. Because they are deep to muscle, they are considered deep veins. Their course is that of the brachial artery : they begin where radial veins and ulnar veins join. They end at the inferior border of the teres major muscle. At this point, the brachial veins join the basilic vein to form the axillary vein.