Which cranial nerve provides sensory information to the face and controls chewing muscles?

Which cranial nerve provides sensory information to the face and controls chewing muscles?

• A. Trigeminal nerve (CN V)
• B. Facial nerve (CN VII)
• C. Glossopharyngeal nerve (CN IX)
• D. Vagus nerve (CN X)

Answer: (A)

The nerve that provides sensory information to the face and also controls the muscles used for chewing is the trigeminal nerve (CN V). It has three divisions—V1 (ophthalmic), V2 (maxillary), and V3 (mandibular). All three divisions carry sensory fibers from the face, but only V3 also carries motor fibers to the muscles of mastication — masseter, temporalis, and the pterygoids — enabling jaw closing and chewing. The other nerves have different primary roles: the facial nerve mainly controls facial expressions and carries taste from the anterior tongue; the glossopharyngeal nerve handles taste and sensation in the posterior tongue and contributes to swallowing; the vagus nerve oversees parasympathetic functions and sensation in the thorax and abdomen and some laryngeal sensation.

The nerve that provides sensory information to the face and also controls the muscles used for chewing is the trigeminal nerve (CN V). It has three divisions—V1 (ophthalmic), V2 (maxillary), and V3 (mandibular). All three divisions carry sensory fibers from the face, but only V3 also carries motor fibers to the muscles of mastication — masseter, temporalis, and the pterygoids — enabling jaw closing and chewing. The other nerves have different primary roles: the facial nerve mainly controls facial expressions and carries taste from the anterior tongue; the glossopharyngeal nerve handles taste and sensation in the posterior tongue and contributes to swallowing; the vagus nerve oversees parasympathetic functions and sensation in the thorax and abdomen and some laryngeal sensation.