FUNCTIONS: will be discussed for each division of CN V.

The trigeminal nerve supplies both sensory and motor innervation to various parts of the head and neck. The first two divisions are purely sensory and will be discussed first.

OPHTHALMIC division (CN V₁) is a sensory nerve that passes through the SUPERIOR ORBITAL FISSURE and supplies the eyeball, conjunctiva, lacrimal gland and sac, nasal mucosa, frontal sinus, external nose, upper eyelid, forehead and scalp.

MAXILLARY division (CN V₂) is a sensory nerve that passes through the FORAMEN ROTUNDUM. It relays sensation from the skin of the face over the maxilla including the upper lip, maxillary teeth, nasal mucosa, maxillary sinuses and palate.