ANAT vestibular system

Question 1

5 components of the vestibular system

Answer 1

peripheral receptor apparatus
central vestibular nuclei
vestibuloocular network
vestibulospinal network
vestibulothalamocortical network

Question 2

which component of the vestibular labyrinth houses the vestibular receptors

Answer 2

membranous labyrinth

Question 3

what type of movement do the semicircular canals detect

Answer 3

rotational head movements

Question 4

what type of movement do the otolith organs detect

Answer 4

translational head movements (linear acceleration)

Question 5

blood supply to labyrinth

Answer 5

labyrinthine a (branch off AICA)
stylomastoid a

Question 6

Meniere’s disease

Answer 6

disruption of normal endolymph volume resulting in endolymphatic hydrops

Question 7

what is a kinocilium

Answer 7

longer stereocilia

Question 8

type 1 vs type 2 hair cells

Answer 8

type 1: chalice-shaped, surrounded by an afferent
terminal; medial
type 2: cylindrical, innervated by synaptic boutons;
lateral

both receive synapses from vestibular efferents that control receptor sensitivity
activated by behaviorally arousing stimuli or CN V

Question 9

what does the vestibuloocular network do

Answer 9

permits keeping a fixed gaze on an object while the head is moving

Question 10

what is vestibuloocular reflex

Answer 10

stabilizing eye movements

helps vestibuloocular network do its thing

Question 11

what detects vertical movements

vestibuloocular reflex

Answer 11

vertical semicircular canals and saccule

Question 12

what detects horizontal movements

vestibuloocular reflex

Answer 12

horizontal canals and utricle

Question 13

what detects torsional eye movements

vestibuloocular reflex

Answer 13

vertical semicircular canals and utricle

Question 14

Caloric test

Answer 14

induces nystagmus

COWS

Question 15

area 2v

vestibular cortex

Answer 15

located on primary somatosensory cortex

sensations of whole body motion

Question 16

area 3a

vestibular cortex

Answer 16

located on primary somatosensory cortex

integrates motor control of head and body

Question 17

area 7
lesion?
(vestibular cortex)

Answer 17

located on parietal cortex
integrates cues of body motion in space
lesion - confusion in spacial awareness

Question 18

subjective vertigo

Answer 18

pt experiences sensations of spinning while things in environment are not moving

Question 19

objective vertigo

Answer 19

sensation is one of objects spinning while patient is not moving

Question 20

benign paroxysmal positional vertigo

Answer 20

brief episodes of vertigo that coincide with changes in body position

otoconial crystals from utricle separate from the otolith membrane and become lodged in the cupula of a semicircular canal (cupulolithiasis)

Question 21

vestibular schwannoma

Answer 21

benign tumor

typically in cerebellopontine angle where it can impinge on CN VII, VIII, labyrinthine a

Question 22

vestibular neuritis

Answer 22

edema of vestibular nerve (or ganglion)?