Summary Origin Lateral epicondyle of humerus Insertion Lateral surface of olecranon and superior part of posterior surface of ulna Action Assists triceps in extending forearm (terminal 15° of extension and supination); stabilizes elbow joint; abducts ulna during pronation Innervation Radial nerve (C7, C8 and T1) (C7, C8, T1) Arterial Supply Medial collateral artery; recurrent posterior interosseous artery, posterior branch of radial collateral artery
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