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The trigeminal nerve, also known as cranial nerve V, is a mixed nerve, meaning it possesses both motor and sensory functions. Its sensory component is responsible for transmitting sensations from the face, including touch, pain, and temperature, to the brain. This enables the body to process sensory information from areas such as the forehead, cheeks, and jaw.

The motor part of the trigeminal nerve primarily controls the muscles involved in mastication (chewing), including the masseter and temporalis muscles. This dual functionality allows the trigeminal nerve to play a critical role in both sensory perception and motor activity.

Therefore, the best description of the functions of the trigeminal nerve is that it encompasses both motor and sensory functions, making it essential for facial sensation and the ability to perform tasks such as eating.