Spinal levels of the axillary nerve?

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Multiple Choice

Spinal levels of the axillary nerve?

Explanation:
Spinal level contributions to a peripheral nerve come from the nerve roots that form that nerve in the brachial plexus. The axillary nerve arises from the posterior cord and is mainly composed of fibers from the C5 and C6 roots. These roots innervate the deltoid and teres minor muscles and provide sensation to the superolateral aspect of the arm, so the axillary nerve carries C5-C6 fibers. While other nerves in the arm can include additional roots (like C7 or C8) for their fibers, the axillary nerve is classically C5-C6, which is why that pair of levels is the correct answer.

Spinal level contributions to a peripheral nerve come from the nerve roots that form that nerve in the brachial plexus. The axillary nerve arises from the posterior cord and is mainly composed of fibers from the C5 and C6 roots. These roots innervate the deltoid and teres minor muscles and provide sensation to the superolateral aspect of the arm, so the axillary nerve carries C5-C6 fibers. While other nerves in the arm can include additional roots (like C7 or C8) for their fibers, the axillary nerve is classically C5-C6, which is why that pair of levels is the correct answer.

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