CN exam

Question 1

What is cranial nerve I called?

Answer 1

Olfactory

Question 2

What is cranial nerve II called?

Answer 2

Optic

Question 3

What is cranial nerve III called?

Answer 3

Oculomotor

Question 4

What is cranial nerve IV called?

Answer 4

Trochlear

Question 5

What is cranial nerve V called?

Answer 5

Trigeminal

Question 6

What is cranial nerve VI called?

Answer 6

Abducens

Question 7

What is cranial nerve VII called?

Answer 7

Facial

Question 8

What is cranial nerve VIII called?

Answer 8

Vestibulocochlear

Question 9

What is cranial nerve IX called?

Answer 9

Glossopharyngeal

Question 10

What is cranial nerve X called?

Answer 10

Vagus

Question 11

What is cranial nerve XI called?

Answer 11

Accessory

Question 12

What is cranial nerve XII called?

Answer 12

Hypoglossal

Question 13

How would you test CNI?

Answer 13

“Have you noticed any change in your sense of smell recently?”

“I would normally test this using smelling tubes to differentiate the smell in the each nostril but I won’ t be doing that now”

Question 14

What do you need to assess to test CN II?

Answer 14

AFRO BC: 
Acuity
visual Fields
Reflexes (light and accommodation)
Ophthalmoscopy

Blind spot
Colour vision

Question 15

How do you assess acuity?

Answer 15

Snellen chart

Question 16

How do you use a Snellen chart?

Answer 16

6M from chart, test corrected and uncorrected vision in each eye. If can’t seee –> 3M –> hand waving –> light perception

Question 17

How do you assess a patient’s blind spot?

Answer 17

Using a red hat pin

Question 18

What are you looking for on assessment of CN III, IV and VI?

Answer 18

Nystagmus

Diplopia- Vertical? Horizontal? Ask if the second image disappears when covering up each eye

Question 19

What muscles are innervated by CNIII?

Answer 19

Superior rectus, inferior rectus, medial rectus and inferior oblique. Levator palpebrae superioris

Question 20

What muscles are innervated by CNIV?

Answer 20

Superior oblique (LR6SO4)

Question 21

What muscles are innervated by CNVI?

Answer 21

Lateral rectus (LR6SO4)

Question 22

What are the 3 major components of CNV?

Answer 22

Motor, sensory and reflex

Question 23

What is the significance of the jaw jerk?

Answer 23

Differentiates between a bulbar and pseudo-bulbar palsy

Question 24

What are the afferent and efferent components of the corneal reflex?

Answer 24

Afferent: V1 (ophthalmic division of trigeminal)

Efferent CN VII

Question 25

What are the divisions of the trigeminal nerve?

Answer 25

V1- ophthalmic
V2- maxillary
V3- mandibular

Question 26

What are the afferent and efferent components of the jaw jerk?

Answer 26

Afferent- V3 (mandibular division)

Efferent- motor CNV

Question 27

How would you tell if a facial nerve palsy was upper or lower motor neurone?

Answer 27

Forehead involvement- forehead sparing –> UMN

Question 28

Why is the forehead spared in UMN lesions of CNVII?

Answer 28

Due to bihemispheric innervation. Other aspects of CNVII only receive contralateral innervation from the pyramidal tract

Question 29

Why can a facial nerve palsy result in hyperacusis?

Answer 29

As CNVII provides LMN innervation to the muscles of stapedius

Question 30

What two effects of CNVIII do you need to test in a CN exam?

Answer 30

Hearing and balance

Question 31

How many gag reflexes are there?

Answer 31

2- right and left

Question 32

When you ask a patient to shrug their shoulders against resistance which muscle are you testing?

Answer 32

Trapezius

Question 33

When you ask a patient to shrug their shoulders against resistance which nerve are you testing?

Answer 33

Accessory (CNXI)