Olfactory: Sensory- Sensory fibers conduct impulses associated with the sense of smell.
II Optic: Sensory- Sensory fibers conduct impulses associated with the sense of vision.
III Oculomotor: Primarily motor- Motor fibers conduct impulses to muscles that raise eyelids, move eyes, adjust the amount of light entering the eyes, and focus lenses.
IV Trochlear: Primarily motor- Motor fibers conduct impulses to muscles that move the eyes. Some sensory fibers conduct impulses associated with the condition of muscles.
V Trigeminal: Mixed
-Ophthalmic division: Sensory fibers conduct impulses from the surface of the eyes, tear glands, scalp, forehead, and upper eyelids.
-Maxillary division: Sensory fibers conduct impulses from the upper teeth, upper gum, upper lip, lining of the palate, and skin of the face.
-Mandibular division: Sensory fibers conduct impulses from the skin of the jaw, lower teeth, lower gum, and lower lip. Motor fibers conduct impulses to muscles of mastication and to muscles in the floor of the mouth.
VI Abducens: Primarily Motor- Motor fibers conduct impulses to muscles that move the eyes. Some sensory fibers conduct impulses associated with the condition of muscles.
VII Facial: Mixed- Sensory fibers conduct impulses associated with taste receptors of the anterior tongue. Motor fibers conduct impulses to muscles of facial expression, tear glands, and salivary glands.
VIII Vestibulocochlear: Sensory
-Vestibular branch: Sensory fibers conduct impulses associated with the sense of equilibrium.
-Cochlear branch: Sensory fibers conduct impulses associated with the sense of hearing.
IX Glossopharyngeal: Mixed- Sensory fibers conduct impulses from the pharynx, tonsils, posterior tongue, and carotid arteries. Motor fibers conduct impulses to muscles of the pharynx used in swallowing and to salivary glands.
XI Accessory: Primarily motor
-Cranial branch: Motor fibers conduct impulses to muscles of the soft palate, pharynx, and larynx.
Spinal branch: Motor fibers conduct impulses to muscles of the neck and back.
XII Hypoglossal: Primarily Motor- Motor fibers conduct impulses to muscles that move the tongue.