The ulnar veins are venae comitantes of the ulnar artery. They drain the superficial venous palmar arch^{[dubious – discuss]}. They arise in the hand and terminate by uniting with the radial veins to form the brachial veins. They mostly drain the medial aspect of the forearm.^{[citation needed]} They receive the venae comitantes of the anterior and posterior interosseous arteries near the elbow, as well as a large branch from the median cubital vein. The ulnar veins are larger than the radial veins.

They follow the same course as the ulnar artery.^{[citation needed]}