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?
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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: -The muscles innervated directly by the XI nerve are the trapezius and the sternocleidomastoid, in addition to the laryngeal musculature (in collaboration with the vagus nerve), such as the palatal, pharyngeal, laryngeal muscles.
Detailed explanation-2: -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.
Detailed explanation-3: -The sternocleidomastoid muscle is innervated by the accessory nerve (cranial nerve XI) and direct branches of the cervical plexus (C2-C3).
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