Which nerve innervates rhomboid major?

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Multiple Choice

Which nerve innervates rhomboid major?

Explanation:
Rhomboid major is supplied by the dorsal scapular nerve, which comes from the C5 root (often with a contribution from C4) of the brachial plexus. This nerve runs to and innervates the rhomboid muscles, enabling them to retract and downwardly rotate the scapula and help stabilize it during arm movements. The spinal accessory nerve primarily innervates trapezius (and to some extent sternocleidomastoid), so it does not innervate the rhomboids. The axillary nerve goes to the deltoid and teres minor, not the rhomboids. The long thoracic nerve innervates serratus anterior. Because only the dorsal scapular nerve supplies the rhomboids, it is the correct innervation.

Rhomboid major is supplied by the dorsal scapular nerve, which comes from the C5 root (often with a contribution from C4) of the brachial plexus. This nerve runs to and innervates the rhomboid muscles, enabling them to retract and downwardly rotate the scapula and help stabilize it during arm movements.

The spinal accessory nerve primarily innervates trapezius (and to some extent sternocleidomastoid), so it does not innervate the rhomboids. The axillary nerve goes to the deltoid and teres minor, not the rhomboids. The long thoracic nerve innervates serratus anterior. Because only the dorsal scapular nerve supplies the rhomboids, it is the correct innervation.

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