Vesibular system

Question 1

role of the vestibular system

Answer 1

controls posture and balance

Question 2

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

Answer 2

labyrinths - made out of bones

Question 3

what makes up the vesibular system

Answer 3

3 seniciruclar canals
utricle and saccule

Question 4

what do the semi ciruclar canals connect to

Answer 4

the utricle

Question 5

what direction are the semiciurlation cannals to each other

Answer 5

90 degrees

Question 6

otolith organs are the

Answer 6

utricel and saccule

Question 7

funciton of otolith organs

Answer 7

acelleartion in vertilcle and horizontal planes

Question 8

what direction deos the utricle meansure in

Answer 8

front / back tilit and horotial acellation

Question 9

what direction does semiculr canlas meausre

Answer 9

acceleration in the rotational plane

Question 10

what are the apulla

Answer 10

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

Question 11

cupula

Answer 11

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

Question 12

what neve is the ampulla conencted to

Answer 12

vestibular nerve - cn8

Question 13

does hte endolymph move with rodation

Answer 13

not intially due to inertia

Question 14

why does the amilla move and not the endolyn

Answer 14

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

Question 15

why when you sudnely stop do you feel dizzy

Answer 15

as endollymph is still moving but the ampula suddenly stops

Question 16

what are the types of cilia, large and small

Answer 16

large - kinocilum
small sterocilia

Question 17

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

Answer 17

cuase depolatio and increase dishcae aps win the veislular derve

Question 18

wha thappesn when the cilia move away from the kinocilmum

Answer 18

moves to hyperpolation and reduces aps

Question 19

what is the sensory appautars of the utriucle and sacculae

Answer 19

macule

Question 20

what directio are teh macula oriated in

Answer 20

in utrilce - horizona
in saccule - verticle

Question 21

how many kinoclium are in the maculae

Answer 21

1

Question 22

how many steroclium anre in the macule

Answer 22

many

Question 23

what type of caco3 cystail is in te maculae

Answer 23

otoliths

Question 24

why is otoliths used insead of endolyn in mcuale

Answer 24

it is heavier, thus more effected by graivty

Question 25

what is te otolyh memane made out of

Answer 25

otolith crystals

Question 26

what are the name for te type of mass on othlih

Answer 26

gelatinous mass

Question 27

what informati goes to the vesiuar neuli in the brain stme

Answer 27

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

Question 28

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

Answer 28

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

Question 29

what is the types of vesibular system reflexes

Answer 29

tonic labyrithine reflexes dynamic righting reflexes vestibulo ocular reflexues

Question 30

what is the tonic labyrithine relfex

Answer 30

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

Question 31

what sensory help hte tonic labyrthine relfex

Answer 31

maculae and neck propicoptors

Question 32

what is the dynamic righting reflex

Answer 32

where ther is rpaid posturla reflexes to stop you falling

Question 33

what happens in dynaic righting relexes

Answer 33

extenion of all limbs

Question 34

what is the vesibulo occular reflex

Answer 34

connects vesiular appartus and vesiblar apartus for postural contol

Question 35

what crail nerves can be triggerd by the vesibular system

Answer 35

3, 4 and 6 for eye movement

Question 36

what is vesibular nystagmus

Answer 36

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

Question 37

what is preventing the eyes overroating

Answer 37

bony orbit and full extion of muscles

Question 38

what happesn when eyes overroatin in vesibuar nystagmus

Answer 38

flick back rapidly to the original position

Question 39

what direction of flip back is right nystagmus

Answer 39

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

Question 40

what is caroric stimulation

Answer 40

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

Question 41

which side is the nystagmus if the fluid si warm

Answer 41

to the effected side

Question 42

which side is te nystam to if the fluid is cold

Answer 42

opposite side

Question 43

cows

Answer 43

cold opposite, warm same side

Question 44

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

Answer 44

nystagmus

Question 45

cuase of motion sickens

Answer 45

mismatch in cerbellum with vesibular stystem and vestibular system

Question 46

what is labyrinthistis

Answer 46

acute interferio with normal vesibular funciotn due to infection

Question 47

what is the symtoms of labyrinthis

Answer 47

ans symtons and vertilce

Question 48

what is vertiog

Answer 48

where you think ther is movement in the absence of movement

Question 49

what is cuase of menieres diesea

Answer 49

over producito of endylyph incres pressure in ear

Question 50

can lesion of brian cuase nystagmus

Answer 50

yes