The inferior ulnar collateral artery is given off about six centimeters above the elbow. Then, it passes medially over the brachialis and pierces the medial intermuscular septum. It then winds around the humerus between the triceps and the bone. It anastomoses above the olecranon with the posterior articular branch of the deep brachial artery and the interosseous recurrent. In its passage across the brachialis, it gives off an anastomotic branch which also pierces the medial intermuscular septum to join the posterior ulnar recurrent, between the olecranon and the medial epicondyle. Ascending and descending branches are also given off to join the superior ulnar collateral above, and the anterior ulnar recurrent in front of the medial epicondyle.

Arteria collateralis ulnaris inferior

Artère collatérale ulnaire inférieure