Exercise 14: The Cranial Nerves

Question 1

CN I. olfactory

Answer 1

s- smell

Question 2

CN II. optic

Answer 2

s- vision

Question 3

CN III. oculomotor

Answer 3

m- extrinsic eye muscles, pupil constriction

Question 4

CN IV. trochlear

Answer 4

m- one extrinsic eye muscle (superior oblique)

Question 5

CN V. trigeminal

Answer 5

s- scalp, most of face, nasal cavity

m- chewing, soft palate, throat & middle ear

Question 6

CN VI. abducens

Answer 6

m- one extrinsic eye muscle (lateral rectus)

Question 7

CN VII. facial

Answer 7

s- taste

m- facial expression, secretion of tears, saliva, & mucus

Question 8

CN VIII. vestibulocochlear

Answer 8

s- hearing and balance

Question 9

CN IX. glossopharyngeal

Answer 9

s- taste, pressure, pain, temperature from tongue and external ear, respiratory
m- swallowing and gagging

Question 10

CN X. vagus

Answer 10

s- taste, fullness, discomfort of GI tract

m- swallowing, speech, decreased heart rate, GI motility

Question 11

CN XI. accessory

Answer 11

m- soft palate, pharynx, sternocleidomastoid, trapezius muscles

Question 12

CN XII. hypoglossal

Answer 12

m- tongue and throat muscles