Finger extension is achieved by which nerve and muscle?

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Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

Finger extension is achieved by which nerve and muscle?

Explanation:
Finger extension is carried out primarily by the extensor digitorum, the muscle that straightens the fingers at the knuckles and contributes to straightening the joints along the fingers. It is innervated by the radial nerve via the posterior interosseous branch, with motor roots typically C7 and C8. That makes the combination of C7-C8 and radial nerve the best match for extending the fingers. The other options don’t fit because the biceps flexes the elbow, extensor carpi radialis mainly extends the wrist rather than the fingers, and abductor digiti minimi moves the little finger away from the other fingers rather than extending them.

Finger extension is carried out primarily by the extensor digitorum, the muscle that straightens the fingers at the knuckles and contributes to straightening the joints along the fingers. It is innervated by the radial nerve via the posterior interosseous branch, with motor roots typically C7 and C8. That makes the combination of C7-C8 and radial nerve the best match for extending the fingers. The other options don’t fit because the biceps flexes the elbow, extensor carpi radialis mainly extends the wrist rather than the fingers, and abductor digiti minimi moves the little finger away from the other fingers rather than extending them.

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