Week 4A - Vesitubular pt 2 - Tues han 28

Question 1

what do semicircular canals detect vs otolith organs?

Answer 1

ssc - angualr accelration
otolith - vertical/horizontal 9linear acc ,+ gravity

Question 2

what are the names of the 2 hair cells ?

Answer 2

sterocilia and kinocillia

Question 3

how are hait cells activated -

Answer 3

deflected

Question 4

why do u feel like spinning in the opposite direction when u stop?

Answer 4

when spinning in one drieciton and accelrating sterocilia are defelected to kin when u stop you decellarte quickly and the decceleration leads to hyperpolarization and a decrease in firing rate in the opposite direction

Question 5

You are a passenger in vehicle travelling from Kelowna to
Vernon. There is little traffic, so you are travelling at a constant
speed. What statement best describes the activity of the utricle
vestibular afferents

Answer 5

they have the same firing rate as compare to rest - moving at constant velovity

Question 6

why does someone get the spins when they drink too much?

Answer 6

alcohol is blood thinner , so decreases density of blood

density between endolymph + cupula is disturbed - less density in cupua causes hair cells to move artifically - esp when lying fown the hari cells get deflected up without any accelerateion

esssentail - blood thinner , decrease density inblod, decrease density in cupula causes hai cells to be defelcted artificially

Question 7

what is BPPV and who does it occur in?

Answer 7

benigh paroxysmal positional vertigo
occurs in older adults

Question 8

what are 2 causes of BPPV?

Answer 8

idiopathic (unknown)
head hit

Question 9

what happens in BPPV (vertigo) and what is the treatment?

Answer 9

the otolith crystals get dislodged in the semicircular canal - esp when lying down and teh canal becomes more sensitye

epley maneuver - directed the crytal out of canal

Question 10

what canal does the epley maneruver work on?

Answer 10

posterior

Question 11

what is a common symptom with theyes in BPPV

Answer 11

Nystagmus - rapid involunaty rhythmic movement of eyes

Question 12

what is epley maneuver

Answer 12

head laid back about 30 degrees - eye twittichw ill occur

head to other side

move to side (45 degrees)

sit up

move vrystal to acnal opening

need tright times and angles so crystal can get out

Question 13

A patient comes to Drs. Nigel, MD and Sasha, MD. They
complain about vertigo and feelings of nausea when
performing specific movements. Which parts of the vestibular system are most likely affected - going up and down in elevator, syaing no to question

Answer 13

saccule
horizontal

Question 14

true or false menieres dissease occurs on both sides of body?

Answer 14

false - one side

Question 15

what is the cause of menieres?

Answer 15

idipathic (ubnnkonw)

Question 16

what is menieres disease?

Answer 16

increase fluid in the labrynth canals, increases pressure in the endolymph - membrane channels is durupted or mebrane between peri and endolymp breaks, mixes fluidss (pos and neg charges) leading to ecrease firing on rates

icnrease firing rat eon intact side - lads to sensatin of head roation

Question 17

Why does drinking excess of alcohol lead to vertigo

Answer 17

dwsity gradient in cupula decreases
hari celsl defelted (esp when lyinf down) bc less dense the endolymph, change sin firing rate

Question 18

what ssc is nodding eys

Answer 18

anerior

Question 19

what ssc is shaking head no

Answer 19

horizontal

Question 20

waht ssc is carwheel

Answer 20

posterior

Question 21

when dirnking excess alcohol leads to vertigo this is bc of decreased density in the _____

Answer 21

cupula

Question 22

staning up spinnning is ___ canal

Answer 22

horizaontal

Question 23

spinning on floor is -___canal

Answer 23

anterior