Cranial Nerves

Question 0

Optic

Answer 0

Purely sensory, carries impulses for vision

Question 1

Olfactory

Answer 1

Purely sensory; carries impulses for the sense of smell

Question 2

Oculomotor

Answer 2

Supplies motor fibers to four of the six muscles (superior, inferior, and medial rectus, and inferior oblique) that direct the eyeball; to the eyelid; and to the internal eye muscles controlling lens shape and pupil size

Question 3

Trochlear

Answer 3

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

Question 4

Trigeminal

Answer 4

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

Question 5

Abducens

Answer 5

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

Question 6

Facial

Answer 6

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

Question 7

Vestibulocochlear

Answer 7

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

Question 8

Glossopharyngeal

Answer 8

Supplies motor fibers to the pharynx (throat)
That promote swallowing and saliva production; carries sensory impulses from taste buds of the posterior tongue and form pressure receptors of the carotid artery

Question 9

Vagus

Answer 9

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

Question 10

Accessory

Answer 10

Mostly motor fibers that activate the sternocleidomastoid and trapezius muscles

Question 11

Hypoglossal

Answer 11

Motor fibers control tongue movements, sensory fibers carry impulses from the tongue