Supinator

Supinator muscle

The supinator muscle is an elbow joint muscle that is used most when your arm is straight and you are turning your forearm outwards. Or to use the correct terminology, extended and supinating.

  • Origin: Lateral epicondyle of the humerus and posterior part of the ulna.
  • Insertion: Lateral surface of the radius.
  • Actions: Supination of the forearm.
  • Innervation: Radial nerve (C6).
  • Daily uses: Unscrewing a screwdriver
  • Example strengthening exercises: Anything that resists forearm supination.
  • Example stretches: Maximal pronation of the forearm.
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