Auditory system

Question 1

what is the normal human hearing range?

Answer 1

20 Hz - 20,000 Hz

Question 2

what range of frequencies are humans most sensitive to?

Answer 2

1-4 kHz

Question 3

how is the dB scale used to measure sound level?

Answer 3

in relation to a reference pressure

Question 4

where is the primary auditory cortex?

Answer 4

superior temporal lobe, Brodmann’s areas 41 and 42

Question 5

‘loudness’ depends on what sounds factors?

Answer 5

frequency and sound pressure

Question 6

air in the outer ear has high or low impedance?

Answer 6

low

Question 7

what innervates the stapedius muscle? tensor tympani muscle?

Answer 7

1. CN 7 2. CN 5

Question 8

which muscle is primarily involved in the sound attenuation reflex?

Answer 8

stapedius

Question 9

is the concentration of potassium in endolymph high or low? where is it found?

Answer 9

1. high 2. scala media

Question 10

where is perilymph found?

Answer 10

scala vestibuli and scala tympani

Question 11

what structure generates the endocochlear potential?

Answer 11

stria vascularis (+80 mV)

Question 12

afferent nerve fibers mainly innervate which hair cells?

Answer 12

inner hair cells