Cranial Nerves Flashcards

1
Q

How do you test CN I?

A

Olfactory

  • test smell in each nostril separately
  • not usually tested unless other CNs are impaired
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do you test CN II?

A

Optic

  • visual acuity
  • snellen chart (allow pt to wear glasses)
  • 20/20 means pt can read at 20 ft with same accuracy as psn with normal vision
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How do you test CN III, IV, and VI?

A

Oculomotor, Trochlear, Abducens

  • opening of eyelids
  • pupillary reflex - pupil constricts in response to light
  • consensual reflex - pupil constricts in response to light in other eye
  • accommodation-convergence reflex - pt follows finger as it is brought toward nose (pupils should constrict)
  • extraocular movement testing - letter ‘H’
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does PERRLA stand for?

A

PE: Pupils Equal
R: Round
RL: Reactive to Light (direct and consensual)
A: responsive to Accommodation (near target)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How do you test CN V?

A

Trigeminal

  • Light touch sensation to the entire face with pts eyes closed
  • pt bites down hard and palpate master muscle
  • Corneal reflex
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How do you test CN VII?

A

Facial

  • Crease up the forehead
  • Keep eyes closed against resistance
  • Reveal the teeth
  • Puff out cheeks
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do you test CN VIII?

A

Auditory
Use tuning fork to test:
-Conductive hearing - Air conduction and bone conduction - vibration through air and bone
- Sensorineural hearing - tests auditory nerve and hair cells in inner ear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How should Rinnes test be interpreted? (tuning fork on mastoid and by ear)

A
  • Normal hearing – air conduction (near ear) time should be twice as long as bone conduction (on mastoid) time
  • Conductive hearing loss – if bone conduction time is longer than or equal to air conduction time
  • Sensorineural hearing loss – if air conduction time is longer but not twice as long as bone conduction time
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How should Weber test be interpreted? (tuning fork on top of head)

A
  • Normal hearing sound will be heard equally in both ears
  • Conductive hearing loss the sound will be heard more/travels toward the poor ear
  • Sensorineural hearing loss the sound will be heard more/travels toward the good ear
  • So if sound is heard louder in one ear it is EITHER conductive loss in that ear or sensorineural loss in the other ear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How do you test CN IX and X?

A

Glossopharyngeal and Vagus

- Gag reflex, swallowing, and taste

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do you test CN XI?

A

Accessory

- Strength of traps and SCM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do you test CN XII?

A

Hypoglossal

  • tongue movement and strength
  • protrude tongue (deviates toward side of weakness) and move from side to side
How well did you know this?
1
Not at all
2
3
4
5
Perfectly