The latissimus dorsi is innervated by which nerve (C6-C8)?

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Multiple Choice

The latissimus dorsi is innervated by which nerve (C6-C8)?

Explanation:
Innervation of the latissimus dorsi comes from the thoracodorsal nerve, a branch of the posterior cord of the brachial plexus that carries fibers from C6 to C8. This nerve specifically targets the latissimus dorsi, the muscle responsible for extending, adducting, and medially rotating the arm. The thoracodorsal nerve travels to the deep surface of the muscle, reflecting its direct role in powering those movements. The other nerves listed supply different muscles: the dorsal scapular nerve goes to the rhomboids and levator scapulae; the lateral pectoral nerve goes to the pectoralis major; and the long thoracic nerve goes to the serratus anterior. None of those nerves innervate the latissimus dorsi, so the thoracodorsal nerve with C6-C8 fibers is the correct choice.

Innervation of the latissimus dorsi comes from the thoracodorsal nerve, a branch of the posterior cord of the brachial plexus that carries fibers from C6 to C8. This nerve specifically targets the latissimus dorsi, the muscle responsible for extending, adducting, and medially rotating the arm. The thoracodorsal nerve travels to the deep surface of the muscle, reflecting its direct role in powering those movements.

The other nerves listed supply different muscles: the dorsal scapular nerve goes to the rhomboids and levator scapulae; the lateral pectoral nerve goes to the pectoralis major; and the long thoracic nerve goes to the serratus anterior. None of those nerves innervate the latissimus dorsi, so the thoracodorsal nerve with C6-C8 fibers is the correct choice.

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