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Neuroscience > 23 JULY 2019 > Flashcards

23 JULY 2019 Flashcards

1
Q

there are two divisions of fx of the vestibular system:

A

physically

visually

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2
Q

the vestibular system’s job is to

A

keep you steady in the world

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3
Q

the vestibular system contributes to

A

maintenance of balance and equilibrium

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4
Q

list of fx of the vestibular system?

A
  1. head movement
    - position related to gravity
  2. gaze stabilization
  3. postural adjustments
  4. autonomic fx & consciousness
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5
Q

all consciousness comes from the

A

cerebral cortex

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6
Q

everything that goes to the cerebral cortex pass through the

A

thalamus

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7
Q

teh vestibular apparatus includes five stsrcutures:

A
  1. semiciruclar canals
  2. vestibulocochlear N
  3. utricle
  4. saccule
  5. cochlea
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8
Q

how many semicircular canals are there?

A

three sets with two each so 6 total

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9
Q

five things to know about the semicircular canals?

A
  1. 3 per side
  2. hair cells in fluid
  3. determines baseline activity
  4. deplorazation rise/ falls
  5. paired activity
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10
Q

when you turn your head AP does what to what ears?

A

the side you are turning to INCREASES

the side you are turning away from DECREASE

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11
Q

acceleration means you

A

get more APs

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12
Q

deceleration means you get

A

less APs

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13
Q

so you when you turn your head which accelerates which decelerates

A

the side you are turning toward ACCELERATES

the side you are turning away from DECELERATES

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14
Q

the “seaweed” if what

A

the hair cells

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15
Q

what is the fx of the hair cells as seaweed

A

tells movement

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16
Q

seaweed floats in what

A

fluid

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17
Q

what do you find at semicircular

A

ampulla

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18
Q

what does baseline activity mean

A

that the hair cells always send the signals

19
Q

paired activity means

A

that there are 3 semicircular canals that work together

20
Q

semicircular canals are

A

angular movement

21
Q

otolithic organ contains what

A
  1. utricle

2. saccule

22
Q

utricle tells us

A

horizontal movement

23
Q

saccule tells us

A

vertical movement

24
Q

otoconia are

A

ear crystals

25
Q

fx of the otoconia are

A

move hairs “seaweed”

26
Q

what moves what with the otoconia and hair cells?

A

the hair cells move the otoconia

27
Q

otoconia allow what

A

your body to feel the pull of gravity

28
Q

vestibular nuclei is apart of what CN / pathway

A

CN VIII: VESTIBULAR DIVISION PATHWAY

29
Q

where is CN VIII tract/ pathway located

A

the pons-medulla junction

30
Q

during eye tracking what is the nystagmus part?

A

the really fast reset

31
Q

during eye tracking what is the reflex part?

A

the tracking

32
Q

difference between the optokinetic

reflex and nystagmus

A 
nystagmus = just fast reset 
reflex = tracking
33
Q

list five locations that can have disorders occur there in the vestibular system

A
  1. peripheral receptors
  2. cranial nerve 8
    3 brainstem nuclei
  3. central porjections axons
  4. corticp reception ares
34
Q

pushers’ syndrome occurs at what location?

A

central projections axon

cortical reception areas

35
Q

s/s of vestibular dx include?

A 
vertigo 
nausa/vomitting 
pathologic nystagmus 
dysequilibrium 
impaired gaze stabilization 
vestibular ataxia 
oscillopsia = no gaze stabilization
36
Q

oscillopsia means

A

complete lack of VOR

presents like the camera on C.O.P.S

37
Q

dysequilibrium means

A

you’re off balance

38
Q

vertigo is

A

the feeling of spinning in the world

39
Q

pathologic nystagmus is when

A

you have oscillations of the eyes with no apparent & no appropriate stimulus

40
Q

impaired gaze stabilization means

A

that the VOR isn’t working in 1 eye or both but it’s just impaired

41
Q

vestibular ataxia is when

A

there is ataxia due to the vestibular system

  • unsteady movements
  • head problems
42
Q

if you had oscillopsia what would it look like

A

your eyes would follow your head no matter what

and the world around you is shaky all the time

43
Q

connections from the vestibular nuclei to cells of the vestibulospinal tracts would influence

A

conscious awareness of head position

Neuroscience (29 decks)

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