Which nerve supplies the majority of extensor muscles in the forearm?

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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 nerve supplies the majority of extensor muscles in the forearm?

Explanation:
Forearm extensors form the posterior compartment, and the nerve that mainly supplies muscles there is the radial nerve. It travels with the arm and into the forearm, giving off the posterior interosseous branch that reaches and innervates the deep extensor muscles responsible for extending the wrist and fingers. The median and ulnar nerves primarily innervate flexor muscles in the anterior forearm (and some hand muscles), while the musculocutaneous nerve targets the flexors of the arm. So, the radial nerve is the key supplier of the forearm’s extensor group.

Forearm extensors form the posterior compartment, and the nerve that mainly supplies muscles there is the radial nerve. It travels with the arm and into the forearm, giving off the posterior interosseous branch that reaches and innervates the deep extensor muscles responsible for extending the wrist and fingers. The median and ulnar nerves primarily innervate flexor muscles in the anterior forearm (and some hand muscles), while the musculocutaneous nerve targets the flexors of the arm. So, the radial nerve is the key supplier of the forearm’s extensor group.

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