Which cranial nerve innervates the muscles of facial expression?

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Multiple Choice

Which cranial nerve innervates the muscles of facial expression?

Muscles that create facial expressions come from the second pharyngeal arch and receive their motor supply from a single nerve that specializes in this function. This nerve travels from the brainstem to the face and then splits into branches that reach the muscles around the eyes, mouth, and cheeks. Its motor fibers are what drive smiling, frowning, blinking, and other expressive movements, making it the primary innervation for facial expression. Other nerves listed don’t fit this role. The nerve that moves the tongue muscles is responsible for tongue control. The nerve that handles face sensation and chewing muscles is mainly sensory-dominant with a motor role for chewing, not the expression muscles. The nerve for hearing and balance serves those sensory functions, not facial movement.

Muscles that create facial expressions come from the second pharyngeal arch and receive their motor supply from a single nerve that specializes in this function. This nerve travels from the brainstem to the face and then splits into branches that reach the muscles around the eyes, mouth, and cheeks. Its motor fibers are what drive smiling, frowning, blinking, and other expressive movements, making it the primary innervation for facial expression.

Other nerves listed don’t fit this role. The nerve that moves the tongue muscles is responsible for tongue control. The nerve that handles face sensation and chewing muscles is mainly sensory-dominant with a motor role for chewing, not the expression muscles. The nerve for hearing and balance serves those sensory functions, not facial movement.

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