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Supinator

Other Terms: Musculus supinator, Muscle supinateur

Muscle parts

None

Latin name

Musculus supinator

Latin muscle parts

None

Group

Antebrachial muscle – posterior compartment – lateral group

Etymology

The English name for this muscle is the muscle that makes the hand lay on its back. The word supinator comes from the Latin supinum meaning “lying on its back.”

Origin

Posterior surface of the lateral epicondyle of the humerus, radial collateral ligament, annular ligament, and the lateral edge of the proximal ulna

Insertion

Lateral and anterior surfaces of the proximal third of the shaft of radius

Action

Supination (active in all phases and ranges of supination, though not as powerful as the biceps)

Nerve supply

Radial nerve (C6 and C7)

Blood supply

The muscle receives direct muscular branches from the radial artery, in addition to branches from the posterior interosseous, radial recurrent, recurrent interosseous, and middle collateral arteries.

Latin

Musculus supinator

French

Muscle supinateur

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