physiology of hearing and balance

Question 1

which frequencies can humans percieve?

Answer 1

20Hz-20000Hz

Question 2

which bit of the ear has what function?

Answer 2

external ear- receiver
middle ear- amplifier
inner ear- receiver/trasnducer

Question 3

what is the functional unit that is located in the organ of corti called?

Answer 3

inner hair cell

Question 4

what is the function of the inner and outer hair cells?

Answer 4

inner-receiving sound
outer- modulating sound

Question 5

where abouts in the cochlear curve is sound perceived

Answer 5

low frequency-apex
high frequency-base

Question 6

what are the features of the eustachian tube?

Answer 6

ventilation pathway for middle ear mucosa
bony and cartilaginous portions
resting state of cartilaginous tube is closed
dysfunction leads to negative middle ear pressure

Question 7

which muscles open the eustachian tube?

Answer 7

tensor veli palatini and levator palatine muscles

Question 8

at what stage in utero can a foetus hear/respond to sound?

Answer 8

can hear at 18 weeks
can respond to sound at 26 weeks