What nerve innervates the sternocleidomastoid?
A)trigeminal nerve (CN V)
B)facial nerve (CN VII)
C)spinal accessory nerve (CN XI)
D)C1

Question

Quizplus · Accepted Answer

The sternocleidomastoid is innervated by the spinal accessory nerve, also known as cranial nerve XI (11). The other options listed do not innervate the sternocleidomastoid muscle. C1 is a spinal nerve and does not innervate the muscle specifically.

What Nerve Innervates the Sternocleidomastoid