Supinator

Musculus supinator

Upper Body ArmsForearms

The supinator wraps around the proximal radius and rotates the palm upward, acting alone in unresisted supination while the biceps adds power against resistance. It is engaged by supinating curls and any movement turning the palm up under load. The posterior interosseous nerve passes through it at the arcade of Frohse, a common site of entrapment.

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Forearm supination

Origin

Lateral epicondyle of the humerus, radial collateral and annular ligaments, supinator crest of the ulna

Insertion

Lateral, posterior, and anterior surfaces of the proximal third of the radius

Innervation

Deep branch of the radial nerve / posterior interosseous nerve (C6-C7)

Blood supply

Radial recurrent and posterior interosseous arteries

Wikipedia ↗

forearmsupinatorelbow