cranial nerves

Olfactory

1

Olfactory

Purely sensory; carries impulses for the sense of smell

Optic

2

Optic

Purely sensory; carries impulses for vision

Oculomotor

3

oculomotor

Supplies motor fibers to four of the 6 muscles that direct the eyeball, to the eyelid, and to the internal eye muscles

Trochlear

4

Trochlear

Supplies motor fibers for one external eye muscle (superior oblique)

Trigeminal

5

Trigeminal

Conducts sensory impulses from the skin of the face and the mucosa of the nose and mouth, also contains motor fibers that activate the chewing muscles

Abducens

6

abducens

Supplies motor fibers to the lateral rectus muscle, which rolls the eye laterally

Facial

7

Facial

Activates the muscles of facial expression and the lacrimal and salivary glands; carries sensory impulses from the taste buds of anterior tongue

Vestibulocochlear

7

Vestibulocochlear

Purely sensory; vestibular branch transmits impulses for the sense of balance, and cochlear branch transmits impulses for the sense of hearing

Vestibulocochlear

8

Glossopharyngeal

supplies motor fibers to the pharynx, that promotes swallowing and saliva production; carries sensory impulses from taste buds of the posterior tongue and pressure receptors of the carotid artery

Glossopharyngeal

9

Vagus

10

Vagus

Fibers carry sensory impulses from and motor impulses to the pharynx, larynx and abdominal and thoracic viscera; most motor fibers are parasympathetic fibers that promote digestive activity and help regulate heart activity

Accessory

11

Accessory

Mostly motor fibers that activate the

sternocleidomastoid and trapezius muscles

Hypoglossal

12

Hypoglossal

Motor fibers control tongue movement. Sensory fibers carry impulses from the tongue