The fifth cranial nerve and the largest. It is mainly sensory except for a small motor branch that supplies the muscles for chewing. The branches of the trigeminal nerve provide sensation to the eye and forehead, midface, and upper and lower jaw.
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 that 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.