Lecture (3/19) Week 9 Tuesday Flashcards
stereocilia sit on top of what
outer and inner hair cells
Stereocilia are made of ______ which is a contractile
actin, protein
Is kinocilium thicker or thinner than stereocilia?
thicker
Which types of cells have sternocila
OHC and IHC
IHC stereocilia are positioned in a _____
row
OHC stereocilia are positioned in a _____
V or W shape
_____ are the most lateral cilia on each hair
kinocilium
kinocilium are towards the _____ _____
stria vascularis
the stereocilia and kinocilium are connected via _____
proteins
T/F stereocilia and kinocilium have the same ionic channels
False
What allows for stereocilia movement
actin
stereocilia are attached to one another via _____ called _____
actin fibers, tip links
T/F only the top of stereocilia move
False.
The entire piece moves together, not just the top
What are the two ways stereocilia are connected?
Tip links
Lateral links
______ sits on top of sensory cells
tectorial membrane
the tectorial membrane is connected at one end of the ______
spiral limbus
the tectorial membrane is _____ tissue made of _____
connective
collagen
What is connected to the tectorial membrane?
OHC
What is Hensen’s stripe?
Where the stereocilia of the OHC connect into the holes of the bottom side of the TM
Do IHC and OHC connect to TM?
no, only OHC
Energy passes through the middle ear as _____ energy
vibratory (mechanical)
where does the stapes footplate vibrate?
Oval window
____ ____ travels along the cochlear partition and is released at the ____ ____
displaced fluid, round window
pressure on the _____ _____ moves the basilar membrane
scala media
the base of the BM has more ____ and less ____
bone, membrane
base of the BM has a _____ resonant frequency
higher
apex of the BM has a ______ resonant frequency
lower
T/F entire BM is set into movement at the same time
false
What is the traveling wave?
hydromechanical wave moves from base to apex
the traveling wave reaches maximum displacement at the point on the BM that is “tuned” to the ___ ___
input frequency
The traveling wave illustrates
place of theory of hearing
Bekesy’s Results
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
Bekesy passive tonal organization
specific frequencies correspond to specific anatomical sites- first place tonotopic organization
the amplitude of BM movement is greater at the
apex (low frequencies)
the speed of BM movement is greater at the
base (high frequencies)
when the sound wave is rarefactioned
hair cell _____
depolarization
sound wave is compression
hair cell ____
hyperpolarization
OHC elongate when
hyperpolarize
OHC contract when
depolarized
Electromobility of OHC
when the OHC contract or elongate due to the proteins in the stereocilia and cell body
