WEEK 9- pt 2 = vestibular system

Question 1

what is the general description of the vestibular system ?

Answer 1

Process sensory information underlying motor responses

Question 2

what doe sthe vestibular system do?

Answer 2

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

Question 3

the vestibular system is important for what

Answer 3

evaluation of head injury

Question 4

what is perilymph

Answer 4

Perilymph is an extracellular fluid located within the inner ear.

Question 5

where is perilymph found

Answer 5

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

Question 6

true or false the tympanic cavity is filled with perilymp

Answer 6

true

Question 7

what is the membranous labyrinth

Answer 7

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

Question 8

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

Answer 8

rotational acceleration

Question 9

what ar eteh otolith organs

Answer 9

utricle and saccule

Question 10

utricle and saccule are involved in which type of motion

Answer 10

horizontal and vertical acceleration (+head tilt)

Question 11

vestibular nuclei project to : (4 things)

Answer 11

extraocular
cervical
postural muscles
cerebellum

Question 12

vestibular nerve is a branch of which cranial nerve

Answer 12

8

Question 13

vestibular system is located in which part of the ear

Answer 13

inner ear in temporal bone

Question 14

vestibular apparatus is atcached to what

Answer 14

cpchlea

Question 15

teh vestibular app is filled wth what

Answer 15

perilymph

Question 16

perylimph sits between what two structures

Answer 16

bone labyrinth
membranous labyritns

Question 17

perylimph can be compared to what

Answer 17

CSF

Question 18

what is perylymph made up of (ion)

Answer 18

potassium

Question 19

moveent of______ hits the hair cells and helps to create AP

Answer 19

endolymph

Question 20

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

Answer 20

3 semicircular canals
2 otolith organs

Question 21

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

Answer 21

vestibular nerve

Question 22

true or false action potentials are generated in ampula and macula

Answer 22

true

Question 23

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

Answer 23

vestibulocerebellum

Question 24

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

Answer 24

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

Question 25

the vestibular system is important fro which reflex

Answer 25

VESTIBULOOCCULAR REFLEX

Question 26

where are vestibular hair cells located

Answer 26

ampulla (of semicircular canals) utricle saccule

Question 27

each otolith organ contains a ____

Answer 27

macula

Question 28

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

Answer 28

yes

Question 29

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

Answer 29

false TOWARD = ACTIVATION

Question 30

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

Answer 30

true

Question 31

what are otoconia (or statoconia)

Answer 31

calcium carbonate crytsals in the otolith organs

Question 32

what does BBPV stand for

Answer 32

Benign Positional Paroxysmal Vertigo

Question 33

what is the general mechanism in which BPPV is caused

Answer 33

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

Question 34

what is teh age range of people who suffer from BPPV

Answer 34

70 +

Question 35

true or false PT can evaluate and treat BPPV

Answer 35

true

Question 36

when otoconia are misplaced where do they end up

Answer 36

in the endolymph of semicircular canaals

Question 37

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

Answer 37

a steady state of AP

Question 38

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

Answer 38

increased firing rate = depolarizition

Question 39

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

Answer 39

decreased

Question 40

during depolarization of hair cells = what ion is flowing in

Answer 40

potassium and then opens calcium channels and it becomes depolarized

Question 41

true or false otolith organs can sense acceelerationand deceltaion

Answer 41

true <3

Question 42

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

Answer 42

true

Question 43

hair cells are imbedded in what in the ampulal

Answer 43

cupula

Question 44

what is the vestibulooccular reflex (vor)

Answer 44

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

Question 45

what is the vestibulo cervical reflex

Answer 45

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

Question 46

what isthe vestiulospinal reflex

Answer 46

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

Question 47

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

Answer 47

false thats the medial one

Question 48

what is decerberation

Answer 48

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

Question 49

what is the deceberate position

Answer 49

extended postion = due to vestibular system by itself

Question 50

does the vestibular system go to thalamus

Answer 50

yes

Question 51

lesion to which lobe caused left hemineglect

Answer 51

right parietal love

Question 52

which part of the thalamus does bvestibular system project to

Answer 52

Vpm head na neck vpl body

Question 53

true or false dehydration can cause dizziness = labyrinhtis

Answer 53

true = reduction of endolymph