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Phgy 455 > WEEK 9- pt 2 = vestibular system > Flashcards

WEEK 9- pt 2 = vestibular system Flashcards

1
Q

what is the general description of the vestibular system ?

A

Process sensory information underlying motor responses

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2
Q

what doe sthe vestibular system do?

A

self motion
head position
spacial orientation relative to gravity
stabilizing gaze head an dposture
nSense of balance
n Body position
n Rapid postural adjustment to maintain balance

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3
Q

the vestibular system is important for what

A

evaluation of head injury

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4
Q

what is perilymph

A

Perilymph is an extracellular fluid located within the inner ear.

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5
Q

where is perilymph found

A

It is found within the scala tympani and scala vestibuli of the cochlea

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6
Q

true or false the tympanic cavity is filled with perilymp

A

true

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7
Q

what is the membranous labyrinth

A

Membranous sacs within the bone that are filled with (endolymph)

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8
Q

anterior posterior and lateral semicircular canals are involved in which type of motion

A

rotational acceleration

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9
Q

what ar eteh otolith organs

A

utricle and saccule

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10
Q

utricle and saccule are involved in which type of motion

A

horizontal and vertical acceleration (+head tilt)

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11
Q

vestibular nuclei project to : (4 things)

A

extraocular
cervical
postural muscles
cerebellum

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12
Q

vestibular nerve is a branch of which cranial nerve

A

8

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13
Q

vestibular system is located in which part of the ear

A

inner ear in temporal bone

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14
Q

vestibular apparatus is atcached to what

A

cpchlea

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15
Q

teh vestibular app is filled wth what

A

perilymph

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16
Q

perylimph sits between what two structures

A

bone labyrinth
membranous labyritns

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17
Q

perylimph can be compared to what

A

CSF

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18
Q

what is perylymph made up of (ion)

A

potassium

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19
Q

moveent of______ hits the hair cells and helps to create AP

A

endolymph

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20
Q

the labyrinth is made up of : (3+2)

A

3 semicircular canals
2 otolith organs

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21
Q

action potentials generated in ampula and macula will be sent to brain via

A

vestibular nerve

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22
Q

true or false action potentials are generated in ampula and macula

A

true

23
Q

an important pathway for balance, posture, head eye movenets and stability is….

A

vestibulocerebellum

24
Q

in the vestibulospinal path…. we being in the….. synapse in the …… project to the…… and go back to the ……..

A

vestibular apparatus
vestibular nuclei
cerebellum (synapse with cerebellar nuclei)
vestibular nuclei

25
Q

the vestibular system is important fro which reflex

A

VESTIBULOOCCULAR REFLEX

26
Q

where are vestibular hair cells located

A

ampulla (of semicircular canals)
utricle
saccule

27
Q

each otolith organ contains a ____

A

macula

28
Q

when deformation is toward the kinocilium is this generating an AP ?>

A

yes

29
Q

true or false, ion channels open when the direction of tilt is away from the kinocilium

A

false
TOWARD = ACTIVATION

30
Q

true or false hair cells are located in the macular (saccule and utricle)

A

true

31
Q

what are otoconia (or statoconia)

A

calcium carbonate crytsals in the otolith organs

32
Q

what does BBPV stand for

A

Benign Positional Paroxysmal Vertigo

33
Q

what is the general mechanism in which BPPV is caused

A

Otoconia displaced from macula & enter one or more of semicircular canals

34
Q

what is teh age range of people who suffer from BPPV

A

70 +

35
Q

true or false PT can evaluate and treat BPPV

A

true

36
Q

when otoconia are misplaced where do they end up

A

in the endolymph of semicircular canaals

37
Q

when your head is in neutral position what kind of ap firing rate are being sent out

A

a steady state of AP

38
Q

if you bend your neck (activating posterior semicircular canals ) toward the kinocilium what happens to the firing rate of AP

A

increased firing rate = depolarizition

39
Q

if you bend your neck (activating posterior semicircular canals ) away from the kinocilium what happens to the firing rate of AP

A

decreased

40
Q

during depolarization of hair cells = what ion is flowing in

A

potassium and then opens calcium channels and it becomes depolarized

41
Q

true or false otolith organs can sense acceelerationand deceltaion

A

true <3

42
Q

semicircular canal is working in partners with one another true or false

A

true

43
Q

hair cells are imbedded in what in the ampulal

A

cupula

44
Q

what is the vestibulooccular reflex (vor)

A

Reflexive eye mvts
Produce eyes movements that counter head movements, so gaze remain fixed on a particular point
VERY RAPID

45
Q

what is the vestibulo cervical reflex

A

movement of head = quicly adjust neck muscles to get back to baseline posotion
= MEDIAL VESTIBULAR NUCLEUS
semicicular canals

46
Q

what isthe vestiulospinal reflex

A

moveent of body
LATERAL VESTIBUEAR NUCLEUS
otolith organ
Extensor muscles Antigravity, Balance, Upright posture

47
Q

true or false the lasteral vestibular system is for adjustment of head and neck

A

false thats the medial one

48
Q

what is decerberation

A

massive lesion to brain above the vestibular system
all you ahve for controlling muscle is not under cerebral cortex

49
Q

what is the deceberate position

A

extended postion = due to vestibular system by itself

50
Q

does the vestibular system go to thalamus

A

yes

51
Q

lesion to which lobe caused left hemineglect

A

right parietal love

52
Q

which part of the thalamus does bvestibular system project to

A

Vpm head na neck
vpl body

53
Q

true or false dehydration can cause dizziness = labyrinhtis

A

true = reduction of endolymph

54
Q
A

Phgy 455 (19 decks)

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