Which muscle is innervated by the axillary nerve?

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Multiple Choice

Which muscle is innervated by the axillary nerve?

Explanation:
The axillary nerve supplies muscles around the shoulder, most notably the deltoid (and teres minor), as it travels from the posterior cord of the brachial plexus through the quadrangular space with the posterior circumflex humeral artery. The deltoid enables abduction of the arm after the first 15 degrees, which is why this muscle is classically associated with the axillary nerve. Other muscles listed have different innervations: latissimus dorsi by the thoracodorsal nerve, pectoralis major by the medial and lateral pectoral nerves, and subscapularis by the upper and lower subscapular nerves.

The axillary nerve supplies muscles around the shoulder, most notably the deltoid (and teres minor), as it travels from the posterior cord of the brachial plexus through the quadrangular space with the posterior circumflex humeral artery. The deltoid enables abduction of the arm after the first 15 degrees, which is why this muscle is classically associated with the axillary nerve. Other muscles listed have different innervations: latissimus dorsi by the thoracodorsal nerve, pectoralis major by the medial and lateral pectoral nerves, and subscapularis by the upper and lower subscapular nerves.

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