Which nerve root corresponds to shoulder abduction (deltoid)?

Prepare for your Cervical Spine Orthopedics II Exam. Engage with multiple choice questions, flashcards, hints, and explanations. Boost your exam confidence!

Multiple Choice

Which nerve root corresponds to shoulder abduction (deltoid)?

Explanation:
The key idea is that the deltoid, which powers shoulder abduction after the first ~15 degrees, is innervated by the axillary nerve. The axillary nerve carries motor fibers from the C5 and C6 nerve roots, making C5 the best single root to identify for deltoid-driven abduction. C6 also contributes via the same nerve, but if you must pick one root, C5 best represents the primary input to the deltoid. The other roots are less relevant: C4 isn’t the main driver for the deltoid, and C7 is more associated with different movements such as elbow and wrist actions.

The key idea is that the deltoid, which powers shoulder abduction after the first ~15 degrees, is innervated by the axillary nerve. The axillary nerve carries motor fibers from the C5 and C6 nerve roots, making C5 the best single root to identify for deltoid-driven abduction. C6 also contributes via the same nerve, but if you must pick one root, C5 best represents the primary input to the deltoid. The other roots are less relevant: C4 isn’t the main driver for the deltoid, and C7 is more associated with different movements such as elbow and wrist actions.

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