Muscle
Supinator
Supinates the extended forearm
High-yield
Deep radial (posterior interosseous) nerve passes through it — site of posterior interosseous nerve entrapment.
Overview
A deep muscle wrapping the proximal radius that supinates the forearm; the deep radial nerve passes through it (arcade of Frohse).
Reference facts
- Origin
Lateral epicondyle of humerus, radial collateral and anular ligaments, and supinator crest of the ulna
- Insertion
Lateral, posterior, and anterior surfaces of the proximal radius
- Action
Supinates the forearm (works with biceps when elbow flexed)
- Innervation
Deep branch of the radial nerve (C7, C8)
- Blood supply
Recurrent interosseous / radial arteries