Supinator

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Original Author(s): Oliver Jones
Last updated: October 5, 2022
Revisions: 2

Original Author(s): Oliver Jones
Last updated: October 5, 2022
Revisions: 2

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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.

Fig 1 – Muscles in the deep layer of the posterior forearm.