Supinator - Podcast Version TeachMeAnatomy 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The supinator is a muscle within the deep compartment of the posterior forearm. It forms the floor of the cubital fossa, and has two heads – which the deep branch of the radial nerve passes between. Attachments: Originates from the lateral epicondyle of the humerus and the posterior surface of the ulna. Inserts onto the posterior surface of the radius. Actions: Supination of the forearm. Innervation: Radial nerve (deep branch). Blood supply: Ulnar artery. By TeachMeSeries Ltd (2025) Fig 1Muscles in the deep 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 Pro Feature - Dissection Atlas Prosection of the radial nerve in the forearm. It divides into superficial and deep branches within the proximal forearm. Prosection of the radial nerve in the forearm. It divides into superficial and deep branches within the proximal forearm. You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Rate This Article