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CNS > Vesibular system > Flashcards

Vesibular system Flashcards

1
Q

role of the vestibular system

A

controls posture and balance

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2
Q

what are the fulid filled memnaous tubes called in the vestibular systme

A

labyrinths - made out of bones

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3
Q

what makes up the vesibular system

A

3 seniciruclar canals
utricle and saccule

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4
Q

what do the semi ciruclar canals connect to

A

the utricle

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5
Q

what direction are the semiciurlation cannals to each other

A

90 degrees

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6
Q

otolith organs are the

A

utricel and saccule

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7
Q

funciton of otolith organs

A

acelleartion in vertilcle and horizontal planes

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8
Q

what direction deos the utricle meansure in

A

front / back tilit and horotial acellation

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9
Q

what direction does semiculr canlas meausre

A

acceleration in the rotational plane

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10
Q

what are the apulla

A

location of the sensory cells in the semiciruclar canals, this is at the base of the canals and feaurs a swelling

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11
Q

cupula

A

hairs of te sneosry recprots are embedded in the cuprula which stretches across

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12
Q

what neve is the ampulla conencted to

A

vestibular nerve - cn8

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13
Q

does hte endolymph move with rodation

A

not intially due to inertia

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14
Q

why does the amilla move and not the endolyn

A

it is attahced to the base of the skull, thus is indepned on enodplymp

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15
Q

why when you sudnely stop do you feel dizzy

A

as endollymph is still moving but the ampula suddenly stops

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16
Q

what are the types of cilia, large and small

A

large - kinocilum
small sterocilia

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17
Q

what happens with distoriation of the cilia in the direction of the kioclium

A

cuase depolatio and increase dishcae aps win the veislular derve

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18
Q

wha thappesn when the cilia move away from the kinocilmum

A

moves to hyperpolation and reduces aps

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19
Q

what is the sensory appautars of the utriucle and sacculae

A

macule

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20
Q

what directio are teh macula oriated in

A

in utrilce - horizona
in saccule - verticle

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21
Q

how many kinoclium are in the maculae

A

1

22
Q

how many steroclium anre in the macule

A

many

23
Q

what type of caco3 cystail is in te maculae

A

otoliths

24
Q

why is otoliths used insead of endolyn in mcuale

A

it is heavier, thus more effected by graivty

25
Q

what is te otolyh memane made out of

A

otolith crystals

26
Q

what are the name for te type of mass on othlih

A

gelatinous mass

27
Q

what informati goes to the vesiuar neuli in the brain stme

A

propiercioan in limbs, trunk, head and neck, and otlith organs

28
Q

what is the effect of teh information entering the vesitlar nuclie in the brain stem

A

goes to extraocular nucli,
cerebal cortesx, kinestheisa
goes to descenign spinal cord motor pathways
cerebellar centres

29
Q

what is the types of vesibular system reflexes

A

tonic labyrithine reflexes
dynamic righting reflexes
vestibulo ocular reflexues

30
Q

what is the tonic labyrithine relfex

A

where the axis of te head is in a constant relationship with the rest of te body

31
Q

what sensory help hte tonic labyrthine relfex

A

maculae and neck propicoptors

32
Q

what is the dynamic righting reflex

A

where ther is rpaid posturla reflexes to stop you falling

33
Q

what happens in dynaic righting relexes

A

extenion of all limbs

34
Q

what is the vesibulo occular reflex

A

connects vesiular appartus and vesiblar apartus for postural contol

35
Q

what crail nerves can be triggerd by the vesibular system

A

3, 4 and 6 for eye movement

36
Q

what is vesibular nystagmus

A

where the head roates agist te moevment so you stay looking at the same way you originally were

37
Q

what is preventing the eyes overroating

A

bony orbit and full extion of muscles

38
Q

what happesn when eyes overroatin in vesibuar nystagmus

A

flick back rapidly to the original position

39
Q

what direction of flip back is right nystagmus

A

the eye rapidly flicks back to the right, thus making it be called right nystagmus

40
Q

what is caroric stimulation

A

where the outer ear is washed with cold or warm fluid, to cause nystagmus

41
Q

which side is the nystagmus if the fluid si warm

A

to the effected side

42
Q

which side is te nystam to if the fluid is cold

A

opposite side

43
Q

cows

A

cold opposite, warm same side

44
Q

what is the effect of a lesion to periphal or central vesnibular pathways

A

nystagmus

45
Q

cuase of motion sickens

A

mismatch in cerbellum with vesibular stystem and vestibular system

46
Q

what is labyrinthistis

A

acute interferio with normal vesibular funciotn due to infection

47
Q

what is the symtoms of labyrinthis

A

ans symtons and vertilce

48
Q

what is vertiog

A

where you think ther is movement in the absence of movement

49
Q

what is cuase of menieres diesea

A

over producito of endylyph incres pressure in ear

50
Q

can lesion of brian cuase nystagmus

A

yes

51
Q
A

CNS (36 decks)

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