Sensations Carried by the Trigeminal Nerve
In addition to controlling muscles, the trigeminal nerve carries sensations from your facial area. The trigeminal nerve contains three branches (that’s why it’s called trigeminal). The mandibular branch takes sensory data from the lower jaw area, all the way from the chin up to the area in front of the ear. The maxillary branch covers the area of the upper jaw, including the lower part of the nose and up to the area right below the eye. The ophthalmic branch takes sensory data from the nose, eyes, and scalp–until ⅔ of the way back on the head.
Another potential source of overstimulation of the trigeminal nerve is a pain in any of these areas, such as jaw pain or tension headaches.