Lecture (3/19) Week 9 Tuesday

Question 1

stereocilia sit on top of what

Answer 1

outer and inner hair cells

Question 2

Stereocilia are made of ______ which is a contractile

Answer 2

actin, protein

Question 3

Is kinocilium thicker or thinner than stereocilia?

Answer 3

thicker

Question 4

Which types of cells have sternocila

Answer 4

OHC and IHC

Question 5

IHC stereocilia are positioned in a _____

Answer 5

row

Question 6

OHC stereocilia are positioned in a _____

Answer 6

V or W shape

Question 7

_____ are the most lateral cilia on each hair

Answer 7

kinocilium

Question 8

kinocilium are towards the _____ _____

Answer 8

stria vascularis

Question 9

the stereocilia and kinocilium are connected via _____

Answer 9

proteins

Question 10

T/F stereocilia and kinocilium have the same ionic channels

Answer 10

False

Question 11

What allows for stereocilia movement

Answer 11

actin

Question 12

stereocilia are attached to one another via _____ called _____

Answer 12

actin fibers, tip links

Question 13

T/F only the top of stereocilia move

Answer 13

False.
The entire piece moves together, not just the top

Question 14

What are the two ways stereocilia are connected?

Answer 14

Tip links
Lateral links

Question 15

______ sits on top of sensory cells

Answer 15

tectorial membrane

Question 16

the tectorial membrane is connected at one end of the ______

Answer 16

spiral limbus

Question 17

the tectorial membrane is _____ tissue made of _____

Answer 17

connective
collagen

Question 18

What is connected to the tectorial membrane?

Answer 18

OHC

Question 19

What is Hensen’s stripe?

Answer 19

Where the stereocilia of the OHC connect into the holes of the bottom side of the TM

Question 20

Do IHC and OHC connect to TM?

Answer 20

no, only OHC

Question 21

Energy passes through the middle ear as _____ energy

Answer 21

vibratory (mechanical)

Question 22

where does the stapes footplate vibrate?

Answer 22

Oval window

Question 23

____ ____ travels along the cochlear partition and is released at the ____ ____

Answer 23

displaced fluid, round window

Question 24

pressure on the _____ _____ moves the basilar membrane

Answer 24

scala media

Question 25

the base of the BM has more ____ and less ____

Answer 25

bone, membrane

Question 26

base of the BM has a _____ resonant frequency

Answer 26

higher

Question 27

apex of the BM has a ______ resonant frequency

Answer 27

lower

Question 28

T/F entire BM is set into movement at the same time

Answer 28

false

Question 29

What is the traveling wave?

Answer 29

hydromechanical wave moves from base to apex

Question 30

the traveling wave reaches maximum displacement at the point on the BM that is “tuned” to the ___ ___

Answer 30

input frequency

Question 31

The traveling wave illustrates

Answer 31

place of theory of hearing

Question 32

Bekesy’s Results

Answer 32

when a high frequency played, the silver particles near the base moved
when a low frequency tone played, the particles near the base moved slightly, but most movement was towards the apex

Question 33

Bekesy passive tonal organization

Answer 33

specific frequencies correspond to specific anatomical sites- first place tonotopic organization

Question 34

the amplitude of BM movement is greater at the

Answer 34

apex (low frequencies)

Question 35

the speed of BM movement is greater at the

Answer 35

base (high frequencies)

Question 36

when the sound wave is rarefactioned
hair cell _____

Answer 36

depolarization

Question 37

sound wave is compression
hair cell ____

Answer 37

hyperpolarization

Question 38

OHC elongate when

Answer 38

hyperpolarize

Question 39

OHC contract when

Answer 39

depolarized

Question 40

Electromobility of OHC

Answer 40

when the OHC contract or elongate due to the proteins in the stereocilia and cell body