Olfactory (I) nerve - sensory; a sense of smell

Optic (II) nerve - sensory, vision, axons, blind spot

Oculomotor (III) nerve-motor; these somatic motor neurons control movements of the eyeball and upper eyelid; adjust the lens for near vision, and constrict the pupil.

Trochlear (IV) nerve - motor; superior oblique muscle of the eyeball; medial rotation; smallest cranial nerve.

Abducens (VI) nerve - motor; nerve impulses cause abduction (lateral rotation) of the eyeball.

Trigeminal (V) nerve - largest cranial nerve; sensory; three branches (opthalmic/eye, maxillary/nose & upper jaw, and mandibular/mastication); sensation of touch, pain, and temperature.

Facial (VII) nerve-sensory portion extends from the taste buds of the anterior two-thirds of the tongue. The motor portion arises from the pons and deals with facial expressions.

Vestibulocochlear (VIII) nerve - has sensory; two branches; the vestibular branch carries impulses for equilibrium, and the cochlear branch carries impulses for hearing.

Glossopharyngeal (IX) nerve-sensory axons carry signals from the taste buds of the posterior one-third of the tongue. Motor neurons arise from the medulla and deal with the release of saliva.

Vagus (X) nerve - mixed nerve. The fundamental structure of the parasympathetic system; is increased GI activity, dilated airways, and decreased HR. Sensory neurons deal with various sensations, such as proprioception and stretching. Motor neurons arise from the medulla and supply muscles of the pharynx, larynx, and soft palate.

Accessory (XI) nerve - motor nerve. Supplies sternocleidomastoid and trapezius muscles to coordinate head movements.

Hypoglossal (XII) nerve - below the tongue; motor; conducts nerve impulses for speech and swallowing**.**