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Cranial Nerve XI (eleven) is know as the spinal accessory nerve and is responsible for the action of shoulder shrugging by way of its innervation of the trapezius muscle.

The function of this cranial nerve may also be tested by asking the patient to turn their head to the left and right and by resisting this motion by placing your hand on their chin (the muscle tested in this second scenario is the Sternocleidomastoid, SCM).

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15y ago
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14y ago

Cranial nerve XI (Accessory nerve) innervates trapezius and sternocleidomastoid (SCM) muscles. Trapezius muscle controls shrugging of the shoulders and SCM - turning the head laterally (side to side)

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12y ago

Accessory

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Q: What cranial nerve controls neck and shoulder movements?
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