Jennifer Morrison on The motor fibers are primarily involved with the muscles used in chewing, tongue movements, and swallowing. The sensory fibers innervate the same areas, including the teeth and most of the tongue in addition to the jaws. Some fibers of the trigeminal nerve innervate the cornea, face, scalp, and the dura mater of the brain. The trigeminal nerve is also sensitive to the airflow changes that occur during breathing. trigeminal neuralgia a form of unilateral facial neuralgia involving the trigeminal nerve, characterized by paroxysms of excruciating pain. Also called tic douloureux. trigeminal nucleus either of two nuclei associated with the three main roots of each trigeminal nerve. Jennifer Morrison 2016.