medial collateral artery medial collateral artery the medial collateral artery (also known as the middle collateral artery) is a branch of profunda brachii artery that descends in the middle head of the triceps brachii and assists in forming the anastomosis with the interosseous recurrent artery above the olecranon of the ulna near the elbow. medial collateral arteryarteries of the back of the forearm and hand. (medial collateral artery not labeled, but region is visible.)detailssourceprofunda brachiisuppliestricepsidentifierslatinarteria collateralis mediata98a12.2.09.023ta24637fma23119anatomical terminology