Which cranial nerve is responsible for facial sensation?

Which cranial nerve is responsible for facial sensation?

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

Answer: (C)

Facial sensation is carried by the trigeminal nerve, the main somatic sensory nerve of the face. It has three divisions that cover the entire face: the first division supplies the forehead, scalp, and cornea; the second division covers the midface, cheek, and upper lip; and the third division innervates the lower face, jaw, and lower lip. These sensory fibers travel from the face to a sensory ganglion and then into the brainstem for processing. The trigeminal nerve is distinct from other cranial nerves in this context: the facial nerve mainly controls facial muscles and carries taste from the front part of the tongue; the glossopharyngeal nerve supplies sensation to the back of the tongue and oropharynx; the vagus nerve handles many autonomic and sensory functions in the thorax and abdomen and some laryngeal areas. So when asked which nerve is responsible for facial sensation, the trigeminal nerve is the correct answer because it provides the somatic sensory input from the entire face.

Facial sensation is carried by the trigeminal nerve, the main somatic sensory nerve of the face. It has three divisions that cover the entire face: the first division supplies the forehead, scalp, and cornea; the second division covers the midface, cheek, and upper lip; and the third division innervates the lower face, jaw, and lower lip. These sensory fibers travel from the face to a sensory ganglion and then into the brainstem for processing. The trigeminal nerve is distinct from other cranial nerves in this context: the facial nerve mainly controls facial muscles and carries taste from the front part of the tongue; the glossopharyngeal nerve supplies sensation to the back of the tongue and oropharynx; the vagus nerve handles many autonomic and sensory functions in the thorax and abdomen and some laryngeal areas. So when asked which nerve is responsible for facial sensation, the trigeminal nerve is the correct answer because it provides the somatic sensory input from the entire face.