Which nerve provides facial sensation and controls chewing?

• A. Facial (CN VII)
• B. Vestibulocochlear (CN VIII)
• C. Glossopharyngeal (IX)
• D. Trigeminal (CN V)

Answer: (D)

Understanding which nerve handles facial sensation and chewing hinges on recognizing the nerve that supplies both sensory input from the face and motor control of the jaw muscles. The trigeminal nerve does exactly that: its sensory branches cover the face, giving information about touch, pain, and temperature, while its mandibular division sends motor signals to the muscles used for chewing, such as the masseter and temporalis. This combination makes it the nerve responsible for both sensing the face and enabling chewing.

The other nerves don’t fit this dual role. The facial nerve mainly controls facial expression and carries some taste sensation from the front of the tongue, but it isn’t the main carrier of facial sensation or the motor power for chewing. The vestibulocochlear nerve is purely about hearing and balance. The glossopharyngeal nerve contributes to taste and swallowing but not the primary sensory innervation of the face or the muscles used in chewing.