In CN V role, which of the following best describes its functions?

• A. Mechanical function only
• B. Sensory to face and oral cavity; motor to mastication; includes tensor veli palatini
• C. Taste to posterior tongue only
• D. Motor to facial muscles only

Answer: (B)

The trigeminal nerve is mixed: it carries sensory information from the face and oral cavity and provides motor control to the muscles used for chewing. Its mandibular division (the motor-containing branch) supplies the muscles of mastication—such as the temporalis, masseter, and the pterygoids—as well as other muscles like the tensor veli palatini. The tensor veli palatini is specifically innervated by a branch from the mandibular division, linking chewing function to a muscle that helps tense the soft palate and open the auditory tube. That combination of sensory input from the face/oral cavity and motor output to the muscles of mastication (including that tensor muscle) is what makes this option the best description of CN V’s roles.