Cranial Nerves

Question 1

CN I the _________ nerve is a _______ nerve and passes through the _____________________

Answer 1

olfactory
sensory
cribiform plate of the ethmoid bone

Question 2

CN II, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 2

optic
sensory
optic canal

Question 3

CN III, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 3

oculomotor
motor
superior orbital fissure

Question 4

CN IV, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 4

trochlear
motor
superior orbital fissure

Question 5

CN V, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 5

trigeminal
sensory and motor
depends on the branch

Question 6

CN VI, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 6

abducens
motor
superior orbital fissure

Question 7

CN VII, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 7

facial
sensory and motor
internal acoustic meatus, facial canal, stylomastoid foramen

Question 8

CN VIII, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 8

vestibulocochlear
sensory
internal acoustic meatus

Question 9

CN IX, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 9

glossopharyngeal
sensory and motor
jugular forament

Question 10

CN X, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 10

vagus
sensory and motor
jugular foramen

Question 11

CN XI, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 11

spinal accessory
motor
jugular foramen, foramen magnum

Question 12

CN XII, the _____ nerve is a _______ nerve and passes through the _____________________

Answer 12

hypoglossal
motor
hypoglossal canal

Question 13

Identify the CN’s associated with the muscles of facial expression; chewing

Answer 13

a. Facial Nerve CN VII facial expression

b. Trigeminal Nerve CN V3 muscles of mastication

Question 14

testing CN I

Answer 14

smell coffee, peppermint, or vanilla with eyes closed & 1 nostril closed

Question 15

testing CN II

Answer 15

sight with 1 eye covered

Question 16

testing CN III

Answer 16

follow finger up & down

Question 17

testing CN IV

Answer 17

look down & in

Question 18

testing CN V

Answer 18

sensation on R & L face – forehead, cheek, jaw

Question 19

testing CN VI

Answer 19

follow finger R & L

Question 20

testing CN VII

Answer 20

smile, lift eyebrows, frown – check symmetry

Question 21

testing CN VIII

Answer 21

rub fingers together next to ear & check for hearing

Question 22

testing CN IX

Answer 22

swallow

Question 23

testing CN X

Answer 23

swallow, cough

Question 24

testing CN XI

Answer 24

elevate shoulders

Question 25

testing CN XII

Answer 25

stick out tongue – check symmetry

Question 26

where is the cribiform plate? what is its function?

Answer 26

Superior part of the ethmoid bone, it is sieve like and is the place holder for the olfactory bulbs. The perforated nature of the bone permits odors to contact the olfactory bulbs.

Question 27

A 64 yo male was diagnosed with an acoustic neuroma (tumor of 8th cranial nerve) where it enters the temporal bone. Which other cranial nerve could be involved as it travels through the same foramen?

Answer 27

facial nerve

Question 28

A 14 yo female noted immediate paralysis of her left face while snow skiing. She was seen at an ER and had a neg head CT. She is referred to physical therapy. You note that she is unable to close the left eye and her left lip is drooped. She does have facial sensation and denies pain. Which cranial nerve do you suspect?

Answer 28

facial nerve

Question 29

Dr. Azzam DPT asks her patient, who has been experiencing periodic double vision, to turn his right eye inward toward his nose and Then turn the eye downward. The patient is able to look inward but not down. When he looks straight ahead, he is able to look down. Which nerve is most likely involved?

Answer 29

trochlear

Question 30

Dr Balardi DPT wants to confirm that her patients abducens nerve is functioning. Which way would she have her patient turn the eye to confirm?

Answer 30

outward

Question 31

Dr Bell is asked to confirm the integrity of the trochlear nerve in the right eye of a patient. Starting with the eyes straight ahead, you would have the patient look:

Answer 31

in and down