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The supinator (Latin: musculus supinator) is a small muscle of the forearm that extends between the distal humerus and proximal radius and ulna. It belongs to the posterior compartment of the forearm muscles, lying in the second (deep) layer. As the name suggests, the supinator provides the supination of the forearm.
|Origin||Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator crest of ulna|
|Insertion||Lateral, anterior and posterior surfaces of proximal one-third of radius|
|Action||Supination of forearm|
|Innervation||Posterior interosseous nerve of radial nerve (C7, C8)|
|Blood supply||Radial recurrent, posterior interosseous and interosseous recurrent arteries|
The supinator originates from the lateral epicondyle of the humerus, radial collateral and annular ligaments and the supinator crest of the ulna.
The supinator inserts on the lateral, anterior and posterior surfaces of the proximal one-third of the radius.
The supinator muscle provides the forearm supination at the proximal radioulnar joint.
The supinator is innervated by the posterior interosseous nerve, which is a branch of the radial nerve (C7, C8).
The supinator muscle receives arterial blood supply from the radial recurrent, posterior interosseous and interosseous recurrent arteries. The first artery is a branch of the radial artery, while the second arises from the common interosseous artery. The latter is a branch of the posterior interosseous artery.