Which are the primary wrist extensors?

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Study for the Muscle Actions and Functions – Anatomy and Movement Test. Equip yourself with multiple choice questions, each with detailed explanations and hints. Prepare confidently for your exam!

Multiple Choice

Which are the primary wrist extensors?

Explanation:
Wrist extension is produced mainly by the extensor muscles on the back of the forearm as they cross the wrist. The primary wrist extensors are the extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi ulnaris. They pull on the base of the metacarpals to lift the hand at the wrist. Extensor digitorum also crosses the wrist and can help extend the wrist, especially when the fingers are held extended, but its main job is to extend the fingers. The other options miss one or more of the primary wrist extensors or rely on a flexor, so the best choice is the one that includes the three primary extensors and notes that extensor digitorum can assist.

Wrist extension is produced mainly by the extensor muscles on the back of the forearm as they cross the wrist. The primary wrist extensors are the extensor carpi radialis longus, extensor carpi radialis brevis, and extensor carpi ulnaris. They pull on the base of the metacarpals to lift the hand at the wrist. Extensor digitorum also crosses the wrist and can help extend the wrist, especially when the fingers are held extended, but its main job is to extend the fingers. The other options miss one or more of the primary wrist extensors or rely on a flexor, so the best choice is the one that includes the three primary extensors and notes that extensor digitorum can assist.

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