scala tympani has the basilar membrane which will be pushed up by the waves of fluid; scala vestibuli also has waves of fluid (will change the most, amplitude of the wave will be biggest here after oval window)
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Inner hair cells have potassium channels
when the tectorial membrane bends hair cell backwards, channel pops
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Outer hair cells (3 distinct rows of hairs)
release ACh after an input of GABA
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Inner hair cells (1 distinct row of hairs)
glutamatergic and depolarize the cochlear nerve
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Effects
noise protection, enhancing signal to noise ration, signal amplification, selective attention, adaptation to sound
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Inferior colliculus
peripheral sound perception (midbrain)
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Medial geniculate nucleus
thalamus
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Primary auditory cortex
inner portion of the temporal lobe
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DTI
more axonal connections in a normal person vs someone who is (legitamately) tone deaf
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Conduction deafness
abnormality w/in the middle ear
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Nerve deafness
abnormality w/in the inner ear
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Cochlea is damaged
repeated bending/folding of the hair cells can cause them to break via overstimulation
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Selective
neurons at the front of the cochlea die which is where the amplitude comes in the harshest
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Damage could come from a repeated stimulation at a specific frequency (ex
jackhammer)
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Complete
born deaf, no hair cells at all
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Tinnitus
ringing in the ears (like phantom limb pain)
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Central deafness
deaf in the brain, extremely rare
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3 semicircular canals w/a jellylike substance and otoliths