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.