The trigeminal nerve, also known as the fifth cranial nerve, is one of the largest and most complex nerves in the head and neck region. It is responsible for transmitting sensory information from the face, including touch, pain, and temperature, to the brain. The trigeminal nerve has three main branches: the ophthalmic branch, the maxillary branch, and the mandibular branch. The ophthalmic branch supplies sensation to the forehead, scalp, and front part of the head, while the maxillary branch innervates the upper jaw, teeth, and cheek. The mandibular branch controls the muscles involved in chewing and provides sensation to the lower jaw, tongue, and part of the ear.

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