Which nerve innervates the trapezius for motor function?

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Multiple Choice

Which nerve innervates the trapezius for motor function?

Explanation:
Motor control to the trapezius comes from the spinal accessory nerve (CN XI). Its motor fibers originate in the upper spinal cord (C1–C5), ascend into the skull, and exit via the jugular foramen to reach the trapezius, where it drives scapular elevation, retraction, and rotation needed for raising the arm. The other nerves listed don’t supply the trapezius motor function: the dorsal scapular nerve goes to the rhomboids and levator scapulae; the axillary nerve to the deltoid and teres minor; the median nerve to forearm flexors and some hand muscles.

Motor control to the trapezius comes from the spinal accessory nerve (CN XI). Its motor fibers originate in the upper spinal cord (C1–C5), ascend into the skull, and exit via the jugular foramen to reach the trapezius, where it drives scapular elevation, retraction, and rotation needed for raising the arm. The other nerves listed don’t supply the trapezius motor function: the dorsal scapular nerve goes to the rhomboids and levator scapulae; the axillary nerve to the deltoid and teres minor; the median nerve to forearm flexors and some hand muscles.

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