vestibular motor function

Question 1

Main role of vestibular system

Answer 1

gaze stabilization during head movement, postural control

Question 2

allows us to maintain gaze stabilization during dynamic head movement

Answer 2

VOR reflex

Question 3

when recording nystagmus, which direction should be recorded?

Answer 3

• fast phase beat

- use patient frame of reference

Question 4

what side do eyes beat during nystagmus?

Answer 4

neurally active side

Question 5

Will bilateral vestibular hypofunction show nystagmus

Answer 5

No

Question 6

how to test VOR reflex

+ test for vestibular hypofunction?

Answer 6

• head impulse test
• head thrust
  + corrective saccade (gaze travels with head, then looks back at target)
  ? (if correction same direction at head turn overshoot target likely CNS)

Question 7

in the case of BPPV, which side does nystagmus beat?

Answer 7

beat toward impaired side

Question 8

why should you always perform oculomotor exam first (smooth pursuit)

Answer 8

• check if both eyes have full range conjugate eye movements

- during VOR can just focus on on eye

Question 9

what does it mean if you see Quick eye movements, no fast phase?

Answer 9

saccadic instrusions (not vestibular nystagmus)
- Common w anxiety, CNS degenerative disorders

Question 10

what will you see if no VOR reflex?

Answer 10

eyes will travel w skull during head thrust test