fifth cranial nerve

n. (Anatomy) trigeminal nerve, principal sensory nerve of the head and face and the motor nerve that controls the muscles used in chewing

The trigeminal nerve (the fifth cranial nerve, also called the fifth nerve or simply V) is responsible for sensation in the face. It is similar to the spinal nerves C2–S5, which are responsible for sensation in the rest of the body. Sensory information from the face and body is processed by parallel pathways in the central nervous system.
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Noun
1. the main sensory nerve of the face and motor nerve for the muscles of mastication
(synonym) trigeminal, trigeminal nerve, trigeminus, nervus trigeminus
(hypernym) cranial nerve

The main sensory nerve of the head and face, and the motor nerve of the muscles used in chewing. Also called the trigeminal nerve.