Test 2 - Lecture 7 (Auditory) Flashcards Preview

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Flashcards in Test 2 - Lecture 7 (Auditory) Deck (31)
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1

outer ear

collects sounds to focus upon middle ear

2

middle ear

amplifies the sound energy for conveyance into the inner ear

3

inner ear

transduces the sound energy into nervous signals

4

compression

increase in density

5

rarefaction

reduction in density

6

quantities of sound (tone and intensity) is from

frequency and amplitude of sound wave

7

reissner's membrane

separates the scala vestibuli from the scala media

8

basilar membrane

separates the scala media from the scala tympani

9

perilymph

fluid within the scala vestibuli and scala tymapani

10

endolymph

fluid within the scala media

11

hair cells

comprise the sensory receptors that transduce sound energy into a neurochemical signal

12

malleus and incus function as

levers

13

stapes functions as

piston

14

oval window is made to

vibrate with the same frequencies and relative amplitudes as the sound waves focused upon the tympanum

15

compression of the basilar membrane moves it

downward
(build in scala tympani - round window bowing outword)

16

rarefaction causes the basilar membrane to displace

upward
(lessen the pressure of scala tympani - draws the round window inward)

17

tectorial membrane

cantilevered gelatinous shelf that forms a cover above the hair cells

18

4 rows of hair cells on basilar membrane

3 rows of outer
1 row of inner

19

magnitude of the shearing force will vary in direct proportion with the

amplitude of the sound waves

20

endolymph has high levels of K; creating an

electrochemical gradient (K from endolymph into perilymph)

21

back and forth K channels opening from the displacement of stereocili is called

mechanosensitive gating

22

displacement towards the tall

conductance is greater (K channels open - depolarization)
- low basal rate of release (low gCa) glutamate

23

displacement towards the away

conductance becomes less (K channels are less open - hyperpolarization)
- high rate of release (high gCa) glutamate

24

low frequencies are detected near the

apex

25

mid frequencies are detected near the

middle

26

high frequencies are detected near the

base

27

tonotopic map

localizing specific frequencies to specific locations along basilar membrane

28

auditory reception

breaks sounds down into their individual frequency components for transmission into the brain

29

intensity

firing rate of individual neurons, along with the total number of neurons that are activated

30

pitch

projection of tonotopic mapping of nervous signals up to the auditory cortex