Hearing Flashcards
What is the order of positioning of the hair cells and two membranes
Basilar on the bottom
Hair cells inbetween
Tentorial membrane on top
Antibiotics and aspirin can effect hearing, how?
Damaging the outer hair cells
What is the name of the cilia on the hair cells?
Stereocilia
What must occur to the cilia for K channels to open?
They must move in the direction of the kinocilium
What is the downstream effect of movement towards the kinocilium?
K channels open > K influx > Depolarisation of the cell > Ca channels open > Neurotransmitter is released
What is special about the endolymph in the scala media?
It is high K - means there will be a K influx in response to channel opening
Which hemisphere is speech usually processed?
Left
Where does integration of sound signalling from both ears occur?
In the brainstem - particularly the superior olivary complex
Sclerosis of the ossicles causes what?
Profound effects on hearing
Compare the roles of the outer and inner hair cells?
Inner hair cells do must of the signal transduction for hearing while the outer ones amplify the movement of the membranes
How do you localise low frequency sounds in the horizontal plane?
Measuring the time for sound to arrive at each ear
T/F Must hearing loss has a known cause?
False
Why do you need impedance matching?
Because transferring sound from air to fluid is usually prevented by reflection
How is the auditory cortex organised?
Tonotopically - different areas are organised by the frequency they can process
The amplitude of sound determines its what?
Loudness