Which muscle is the chief supinator of the forearm?

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Multiple Choice

Which muscle is the chief supinator of the forearm?

Explanation:
Forearm rotation to turn the palm up is driven mainly by the supinator muscle. This deep muscle sits in the posterior compartment and wraps around the proximal radius. When it contracts, it directly rotates the radius to produce true supination, especially when the elbow is extended. The biceps brachii can help with supination, but only as an accessory mover—its favorable leverage comes when the elbow is flexed, and its primary job is elbow flexion. The brachialis is an elbow flexor, not a supinator, and the pronator teres performs the opposite action, pronation. So, the chief supinator of the forearm is the supinator muscle.

Forearm rotation to turn the palm up is driven mainly by the supinator muscle. This deep muscle sits in the posterior compartment and wraps around the proximal radius. When it contracts, it directly rotates the radius to produce true supination, especially when the elbow is extended. The biceps brachii can help with supination, but only as an accessory mover—its favorable leverage comes when the elbow is flexed, and its primary job is elbow flexion. The brachialis is an elbow flexor, not a supinator, and the pronator teres performs the opposite action, pronation. So, the chief supinator of the forearm is the supinator muscle.

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