Supinator

Supinator

The Supinator is a broad muscle in the posterior compartment of the forearm, curved around the upper third of the radius. It is one of the major muscles responsible for the supination of the forearm, which turns the hand to the palm forward position.

Anatomy

The supinator muscle originates from the lateral epicondyle of the humerus, the radial collateral ligament, the annular ligament, and the supinator crest of the ulna. It inserts into the lateral, posterior, and anterior surfaces of the proximal third of the radius.

Function

The primary function of the supinator muscle is to supinate the forearm, turning the hand to the palm forward position. It is also capable of weak elbow flexion.

Clinical significance

Injury or paralysis of the supinator muscle can lead to a loss of the ability to supinate the forearm, known as supinator syndrome. This can be caused by trauma, overuse, or nerve damage.

See also

• Anatomy
• Forearm
• Humerus
• Radius (bone)
• Ulna
• Supination
• Supinator syndrome

References

Supinator Resources
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