Cranial nerve tests

Question 1

CN I

Answer 1

Ophthalmic - identify smells

Question 2

CN II

Answer 2

Optic - read Snellen chart, assess when finger is observed moving into the visual field

Question 3

CN III

Answer 3

Oculomotor - Pupil shape = round, equal, and +2. Pupillary reflex with penlight, convergence and ability to follow H pattern

Question 4

CN IV

Answer 4

Trochlear - Follow figure H with eyes

Question 5

CN V

Answer 5

Trigeminal - sensations of pain, touch and temperature of the face. “can you feel this?”

Question 6

CN VI

Answer 6

Abducents - Follow figure H with eyes

Question 7

CN VII

Answer 7

Facial - Taste in first 2/3 of tongue, symmetry of face, close eyes, smile, frown, tearing function

Question 8

CN VIII

Answer 8

Vestibulocochlear - Finger rub, Weber and Rinne, Romberg tests.

Question 9

CN IX

Answer 9

Glossopharyngeal - taste posterior 1/3, gag reflex, position of uvula, speak or swallow

Question 10

CN X

Answer 10

Vagus - speak or swallow

Question 11

CN XI

Answer 11

Accessory - shoulder shrug, head rotation to resistance

Question 12

CN XII

Answer 12

Hypoglossal - no deviation of tongue upon extension

Question 13

Normal conduction of hearing

Answer 13

air conduction is longer than bone conduction

Question 14

Weber’s test evaluates

Answer 14

sensorineural hearing and/or CN VIII damage

Question 15

Rinne’s test evaluates

Answer 15

bone conduction vs air conduction

Question 16

The vestibule provides

Answer 16

linear acceleration

Question 17

the semmicircular canals provide

Answer 17

angular acceleration

Question 18

the cochlea provides

Answer 18

sound

Question 19

Barany’s test evaluates

Answer 19

nystagmus - fast component towards direction of angular acceleration

Question 20

blind spot calculation

Answer 20

C = 10(2)/

measured blind spot +3

Question 21

ficks

Answer 21

rate = change in concentrationxareatime/

distance * MW

Question 22

rate of diffusion for agar

Answer 22

distance/time

Question 23

how does solubility affect rate of diffusion

Answer 23

Increased solubility = increase rate of diffusion

Question 24

pupillary reflex

Answer 24

shine light into retina - CN II delivers sense to mesencephalon - CN III - constriction of pupils

Question 25

if you cut the optic nerve you will lose vision

Answer 25

in the side that was cut

Question 26

if you cut the optic tract you will lose vision

Answer 26

partially in both eyes

Question 27

If you have problems with the geniculocalcarine tract you will lose

Answer 27

partial vision in both eyes.

Question 28

a tumor or problem with the optic chiasm will result in

Answer 28

loss of vision in both eyes.

Question 29

myopia

Answer 29

elongated eyeball, focal point in front of retina, concave lens to correct

Question 30

hypermyopia

Answer 30

short eyeball, focal point behind retina, convex lens to correct

Question 31

damage to auditory pathways in CNS causes

Answer 31

partial hearing loss in BOTH ears

Question 32

the vestibulocochlear nerve enters the brainstem at the level of the

Answer 32

pons

Question 33

Patellar reflex

Answer 33

L4 - knee jerk stretch reflex; absence or hypoactive = peripheral nerve damage or ventral horn disease hyperactive = corticospinal tract lesions

Question 34

Achilles reflex

Answer 34

S1 = plantar flexion; absence = damage, sciatica, disc herniation, hypothyroidism, peripheral neuropathy

Question 35

Corneal reflex

Answer 35

CN 5, 7 = blink reflex and pupil dilation; absence indicates brain stem damage

Question 36

Gag reflex

Answer 36

CN 9 10 = contraction of back of throat

Question 37

ciliospinal reflex

Answer 37

dilate pupil in response to pain in the neck face and upper trunk, pupil dilates on side of pain. Horner's syndrome

Question 38

Plantar reflex

Answer 38

babinski's sign

Question 39

which nerves are involved in heart rate and blood pressure

Answer 39

IX - glossopharyngeal | X - vagus

Question 40

which nerves are involved in salivations

Answer 40

VII - facial | IX - glossopharyneal

Question 41

which nerves are involved in mastication

Answer 41

V - trigeminal | XII - hypoglossal

Question 42

which nerves are involved in swallowing

Answer 42

IX - glossopharyngeal X - vagus XI - accessory XII - hypoglossal

Question 43

afterimage is tested by

Answer 43

by rubberband test

Question 44

adaption is tested by

Answer 44

weight on hand

Question 45

thermoreceptors tested by

Answer 45

hand in hot/cold water

Question 46

referred pain tested by

Answer 46

elbow in ice, pain in arm/shoulder