Anconeus originates on the posterior surface of the lateral epicondyle of the humerus and inserts distally on the superior posterior surface of the ulna and the lateral aspect of the olecranon.

What is the action of the anconeus?

Function. Functionally the anconeus fulfills the same tasks at the elbow as the triceps muscle. Its contraction leads to the extension of the forearm. Furthermore, it keeps the tension of the dorsal joint capsule, thus preventing damages during hyperextension.

Is anconeus and extensor?

It is innervated through a branch derived from the radial nerve that travels beside the medial collateral artery to the muscle. The anconeus muscle functions as an accessory extensor beside the triceps brachii and possibly contributes to posterolateral elbow stability during forearm rotation.