Vessel · Forearm

Ulnar artery

Arteria ulnaris

The ulnar artery is the larger of the two terminal branches of the brachial artery, running down the little-finger side of the forearm. In the lower forearm it keeps company with the ulnar nerve, and the two enter the hand together through Guyon's canal at the wrist, where the artery is exposed to the same pressure on the heel of the hand that troubles the nerve. In the palm it forms the superficial palmar arch, the main blood supply to the fingers.