The Ulnar artery arises from the bifurcation of the brachial artery near the neck of the radius. It descends through the anterior compartment of the forearm, passing initially deep to the pronator teres, and lying on the deep aspect of the flexor carpi ulnaris muscle throughout the forearm. At the wrist, pulsations of the ulnar artery can be felt on the lateral side of the flexor carpi ulnaris tendon. The ulnar nerve lies medial to the ulnar artery.
In the region of the elbow in approximately 3% of people, the ulnar artery descends
superficial to the flexor muscles. Its pulsation can be felt and may be visible.
This variation must be kept in mind when drawing blood or making intravenous
injections in this region.