Anatomy, Shoulder and Upper Limb, Forearm Extensor Carpi Ulnaris Muscle

Excerpt

The extensor carpi ulnaris muscle is an elongated fusiform muscle located in the posterior compartment of the forearm and primarily functions to extend and adduct the wrist. It spans between the elbow and the base of the little finger. The extensor carpi ulnaris muscle belongs to the superficial group of extensors of the forearm along with brachioradialis, anconeus, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, and extensor digiti minimi.

Its origin lies in the lateral epicondyle of the distal humerus and the posterior aspect of the ulna. It inserts onto the dorsal base of the fifth metacarpal after passing through the sixth compartment of the extensor retinaculum. It receives its innervation from the posterior interosseous nerve and gets its blood supply from the ulnar artery.