BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What nerve is mostly motor fibers that activate the sternocleidomastoid and trapezius muscles? allows head and shoulders movement and allows for swallowing
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Vestibulocochlear
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Accessory
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Vagus
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Facial
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Explanation:
Detailed explanation-1: -Accessory nerve. The accessory nerve provides motor function to some muscles in the neck. It controls the sternocleidomastoid and trapezius muscles that allow a person to rotate, extend, and flex the neck and shoulders. The accessory nerve separates into spinal and cranial parts.
Detailed explanation-2: -Motor neurons at C1–2 innervate the sternocleidomastoid, while neurons at C3–4 innervate the trapezius. This innervational pattern can account for isolated weakness of one muscle or the other.
Detailed explanation-3: -The nerve that innervates the trapezius and sternocleidomastoid muscles is the accessory nerve. The accessory nerve is the cranial nerve XI. It has a purely somatic motor function.
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