| A | B |
|---|
| Olfactory. | Purely sensory; carries impulses for the sense of smell. |
| Optic. | Purely sensory; carries umpulses for vision. |
| Oculomotor. | Supplies motor fibers to four of the six muscles(superior, inferior, medial rectus, and inferior obligue) that direct the eyeball, the eyelid, and the internal eye muscles. |
| Trochlear. | Supplies motor fibers for one external eye muscle(superior obligue) |
| Trigeminal. | Conducts sensory impulses from the skn of the face and mucosa of the nose and mouth; also contains motor fibers that activate the chewing muscles. |
| Abducens. | Supplies motor fibers to the lateral rectus muscle, which rolls the eye laterally. |
| Facial. | Activates the muscles of facial expression and the lacrimal and salivary glands; carries sensory umpulses from the taste buds of anterior tongue. |
| Vestibulocochlear. | Purely sensory; vestibular branch transmits impulses for the sense of balance, and cochlear branch transmits impulses for the sense of hearing. |
| Glossopharyngeal. | Supplies motor fibers to the throat that promote swallowing and saliva production; carries sensory impulses from taste buds of the posterior tongue and from pressure receptors of the carotid. |
| Vagus. | Fibers carry sensory impulses from and motor impulses to the pharynx, larynx, the abdominal and thorcic viscera; most motor fibers are parasympathetic fibers that promote digestive activity and help regulate heart activity. |
| Accessory. | Mostly motor fibers that activate the sternocleidomastoid and trapezius muscles. |
| Hypoglossal. | Motor fibers control tongue movements; sensory fibers carry impulses from the tongue. |
