hearing and balance

Question 1

what is the name of the part of the ear that sound wave travels through

Answer 1

scala vestibuli

Question 2

describe how action potential in CNVIII nerve

Answer 2

hair in basilar membrane bends, opens K= ion channels so potassium can move from Scala media to CNVIII

Question 3

what is the acoustic reflex

Answer 3

involuntary muscle contraction in response to etc loud sounds ( decreases vibrational energy so less pressure on hair cells )

Question 4

what muscles are involved in the acoustic reflex

Answer 4

strapedius and tensor tympani

Question 5

what is conductive hearing loss

Answer 5

damage to outer/middle ear

Question 6

what is sensorinuel hearing loss

Answer 6

damage to inner ear/brain

Question 7

describe the rhines test and normal result

Answer 7

tuning fork held on bone then ear
air conduction should be better than bone

Question 8

describe the webers test and normal result

Answer 8

tuning fork held on top of head, sound should be heard equally

Question 9

if hearing loss is conductive what is the expected rhines test result

Answer 9

bone conduction is better than air

Question 10

if hearing loss is conductive what is the expected webers test result

Answer 10

affected ear is louder

Question 11

if hearing loss is sensorinuel what is the expected rhines test result

Answer 11

air conduction is better than bone conduction (normal)

Question 12

if hearing loss is sensiorinuel what is the expected webers test result

Answer 12

louder in normal ear

Question 13

name the 2 structures in the ear that contribute to balance

Answer 13

3x semicircular canals filled with endolymph
sensory hair cells

Question 14

how does balance control work

Answer 14

fluid moves with head, hair cells bend opening K+ ion channels, stimulating vestibular nerve