vestibular

Question 1

vestibular system functions

Answer 1

1. stabilizing visual images on the fovea of he retina during head movements
2. maintaining postural stability
3. providing information for spatial orientation

Question 2

3 semicircular canals

structures here

Answer 2

• ampulla

- cupula (have the hair cells here)

Question 3

otolith organs

Answer 3

saccule and utricle

Question 4

vertical linear acc.

Answer 4

saccular excitation

Question 5

horizontal linear acc.

Answer 5

utricle excitation

Question 6

VOR

Answer 6

maintain stability of an image on the fovea of the retina during rapid head movements. VOR must generate rapid compensatory movements in the direction opposite the head rotation

Question 7

VOR gain

Answer 7

eyes and head move in opposite directions with equal velocity

Question 8

VOR phase

Answer 8

the amplitude relationship between eye and head.

should represent an equal but opposite head and eye relationship

Question 9

vertigo a

Answer 9

an illusion of movement

Question 10

oscillopsia

Answer 10

subjective experience of motion of objects in the visual environment that are known to be stationary

Question 11

vertigo lasting for seconds to minutes think

Answer 11

BPPV

Question 12

vertigo lasting for hours think

Answer 12

Menier’s

Question 13

vertigo lasting for days think

Answer 13

vestibular neuronitis or think migraine associated

Question 14

DHI

Answer 14

functional
emotional
physical components

Question 15

nystagmus

Answer 15

primary indicator for central vs. peripheral lesions

Question 16

peripheral vs. central nystagmus

Answer 16

peripheral: will attenuate, torsional upbeats
central: will not attenuate, vertical upbeats

Question 17

neuritis

Answer 17

sudden onset of vertigo and nausea

severe for 3-4 days (unilateral)

Question 18

labyrinthitis

Answer 18

due to infection, inflammation of SCC, will hae pain and hearing loss (unilateral)

Question 19

menier’s disease

Answer 19

increase in endolymph volume causing labyrinthine distension/rupture
fullness in ears, loss of hearing, tinnitus, vertigo

lasts 2-4 hours, episodic unilateral, common

Question 20

perilymphatic fistula

Answer 20

a passage between perilymph and middle ear (uncommon)

Question 21

aoustic neuroma

Answer 21

CN 8-vestibulocochlear tumor, progressive unilateral hearing loss, tinnitus, mild disequilibrium

Question 22

bilateral vestibular loss

Answer 22

usually due to meningitis, DM, ototoxic drugs (irreversible)

Question 23

central vertigo

Answer 23

caused by CVA, HI, cerebellum involved usually, constant dizziness, spontaneous

Question 24

mal de barquement, migraine, anxiety, cervical

Answer 24

non-vestibular causes of dizziness/imbalance