The anconeus is a muscle within the superficial compartment of the posterior forearm. Attachments: Originates from the lateral epicondyle of the humerus and attaches to the olecranon of the ulna. Actions: Abduction of the ulna during pronation of the forearm. Weak extensor of the elbow. Innervation: Radial nerve. Blood supply: Profunda brachii artery By TeachMeSeries Ltd (2025) Fig 1The muscles in the superficial layer of the posterior forearm. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article