"origin: lateral epicondyle of the humerus"
"insertion: olecranon and proximal quarter of the posterior shaft of the ulna"
"arterial supply: posterior interosseous recurrent artery"
"innervation: radial nerve"
"action: elbow extension (weak) 5"
Expected headings
"Terminology"
"Function"
"Its functional significance is not well understood 5; it may act as an active lateral stabiliser of the elbow, helping to reduce varus instability 6."