CN

Question 1

CN 1 (olfactory nerve) is sensory or motor and what is its major function

Answer 1

Sensory / sense of smell

Question 2

CN 2 (optic nerve) is sensory or motor and what is its major function

Answer 2

Sensory / vision

Question 3

CN 3 (oculomotor nerve) is sensory or motor and what is its major function

Answer 3

Motor / inferior oblique eye muscle + medial superior inferior rectus eye muscles (eye movements) + superior levator palpabrae (elevate eyelid) + papillary constriction

Question 4

What happens if the CN1 is damaged

Answer 4

Anosmia

Question 5

What happens if the CN2 is damaged

Answer 5

Blindness, vision impaired, homonymous hemianopsia

Question 6

CN1 olfactory nerve is sensory or motor and what is its major function

Answer 6

Sensory / smell

Question 7

CN2 optic nerve is sensory or motor and what is its major function

Answer 7

Sensory / vision

Question 8

CN3 oculomotor nerve is sensory or motor and what is its major function

Answer 8

Motor / inferior oblique muscle + medial, inferior, and superior rectus eye muscles (eye movements) + levator palpabrae superioris (elevate eyelid) + pupillary constriction

Question 9

CN4 trochlear nerve is sensory or motor and what is its major function

Answer 9

Motor / superior oblique muscle (eye goes down when adducted)

Question 10

CN5 Trigeminal nerve is sensory or motor and what is its major function

Answer 10

Sensory & Motor / somatic sensation from face, mouth, cornea, muscles of mastication

Question 11

CN6 abducens nerve is sensory or motor and what is its major function

Answer 11

Motor / lateral rectus muscle (abducts the eye)

Question 12

CN7 facial nerve is sensory or motor and what is its major function

Answer 12

Sensory and motor / muscles of facial expression, taste of the anterior 2/3 of tongue, lacrimal and salivary glands

Question 13

CN8 vestibulochochlear nerve is sensory or motor and what is its major function

Answer 13

Sensory / hearing & sense of balance

Question 14

CN9 Glossopharyngeal nerve is sensory or motor and what is its major function

Answer 14

Sensory and motor / sensation from posterior 1/3 of tongue + innervate pharyngeal muscles

Question 15

CN10 vagus nerve is sensory or motor and what is its major function

Answer 15

Sensory and motor / autonomic function of gut, cardiac inhibition, sensation from larynx and pharynx, muscles of vocal cords, swallowing, muscles of larynx, pharynx, and base of the tongue

Question 16

CN11 accessory nerve is sensory or motor and what is its major function

Answer 16

Motor / trapezius and SCM

Question 17

CN 12 hypoglossal nerve is sensory or motor and what is its major function

Answer 17

Motor / intrinsic and extrinsic tongue muscles

Question 18

What happens when the CN1 is damaged

Answer 18

Anosmia

Question 19

What happens when the CN2 is damaged

Answer 19

Blindness, impaired vision, homonymous hemianopsia

Question 20

What happens when the CN3 is damaged

Answer 20

Pupil dilation, Horners syndrome

Question 21

What happens when the CN4 is damaged

Answer 21

Eye can’t look down when adducted

Question 22

What happens when the CN5 is damaged

Answer 22

Loss of facial sensation, numbness + loss of Ipsilateral corneal reflex, weakness and wasting of mastication muscles, jaw deviation to the Ipsilateral side when opened

Question 23

What happens when the CN6 is damaged

Answer 23

Eye pulled inward, can’t look laterally

Question 24

What happens when the CN7 is damaged

Answer 24

Ipsilateral facial paralysis (unable to close eye, mouth corner droops, difficulty with speech articulation) / PNI > Bell’s Palsy or facial paralysis due to stroke

Question 25

What happens when the CN8 is damaged

Answer 25

Vertigo, disequilibrium, nystagmus, deafness, tinnitus, hearing loss

Question 26

What happens when the CN9 is damaged

Answer 26

Dysphonia, dysphagia, absent gag reflex

Question 27

What happens when the CN10 is damaged

Answer 27

Palate does not elevate, unilateral paralysis there is asymmetrical elevation + absent gag reflex

Question 28

What happens when the CN11 is damaged

Answer 28

Atrophy, fasciculations, weakness (PNI: shoulder drops and unable to shrug the Ipsilateral shoulder, unable to turn head to contralateral side)

Question 29

What happens when the CN12 is damaged

Answer 29

Movement impairment in tongue, tongue deviation to the weak side, atrophy, fasciculations, dysarthria

Question 30

Use non-noxious odors such as lemon, coffee, tobacco, close off one nostril and test the other and vice versa which CN nerve are we testing

Answer 30

CN 1

Question 31

Using visual snellen chart (testing each eye separately closing off one and testing the other) + test central & peripheral vision with finger test which CN nerve are we testing

Answer 31

CN 2

Question 32

Testing extraocular movements, saccadic eye movements (look in each direction) and smooth pursuit movements (following a moving finger), ptosis, strabismus, dysconjugate, double vision which CN nerve are we testing

Answer 32

CN 3,4,6

Question 33

Testing sensation of face (sharp, dull) test with eyes closed, test corneal reflex (touch with wisp of cotton) + jaw reflex (open and close jaw against resistance) which CN nerve are we testing

Answer 33

CN 5

Question 34

Corneal reflex CN nerves

Answer 34

CN 5 & 7

Question 35

Examining asymmetry in the face at rest and during contraction + testing taste at anterior 2/3 of tongue which CN nerve are we testing

Answer 35

CN 7

Question 36

Using vibrating tuning fork (Weber & Rinnie’s tests) + balance, head-eye coordination, vestibular-ocular reflex which CN nerve are we testing

Answer 36

CN 8

Question 37

Gag reflex + examine taste at posterior 1/3 of tongue which CN nerve are we testing

Answer 37

CN 9

Question 38

Examine swallowing, voice quality, uvula & soft palate deviation or asymmetry (have patient say “ahhh”) + gag reflex which CN nerve are we testing

Answer 38

CN 10

Question 39

Examine strength of SCM & trapezius, asking the patient to shrug their shoulders against downward resistance (trapezius) and rotate their head against resistance (SCM) to detect weakness, atrophy, or asymmetry which CN nerve are we testing

Answer 39

CN 11

Question 40

Move tongue side to side while tongue protruded, which CN nerve are we testing

Answer 40

CN 12

Question 41

Testing pupillary reflex with light test which CN nerve are we testing

Answer 41

CN 2 & 3

Question 42

What CN nerves are responsible for gag reflex

Answer 42

CN 9 & 10