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Which muscle is the primary supinator of the forearm when... | QuestionStock

Representative image for question: Which muscle is the primary supinator of the forearm when the elbow is extended?

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Medicine

Which muscle is the primary supinator of the forearm when the elbow is extended?

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Which muscle is the primary supinator of the forearm when the elbow is extended?

Options:

Supinator
Biceps brachii
Pronator teres
Brachioradialis

Correct answer: Supinator

Explanation: The supinator muscle is the main supinator when the elbow is extended; it originates at the lateral epicondyle and is innervated by the deep branch of the radial nerve (posterior interosseous nerve).

Created 2026-03-10T17:31:55.085Z. Updated 2026-03-10T17:31:55.085Z.