- Click here for access to the full Anatomy Glossary.
- Right click on the image for a downloadable file of this muscle.
- Use of this artwork requires proper credit to be given (Permission: Dr. Joe Muscolino. www.learnmuscles.com – art work Giovanni Rimasti)
The Supinator is in the Deep Layer of the Posterior Compartment of the forearm.
The Supinator has two layers: Superficial Layer and Deep Layer.
- Lateral epicondyle of the humerus and the proximal ulna to the proximal radius.
- Supinates the forearm at the radioulnar joints.
- The supinator and pronator teres muscles attach at nearly identical locations on the radius, but approach the radius from different directions, hence the antagonistic joint actions of supination versus pronation.
- The posterior interosseus nerve (a branch of the radial nerve) runs between the two layers of the supinator and can become compressed there.