hearing and deafness anatomy & physiology. protection impedance match capture; amplify mid-freqs...
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Protection
Impedance match
Capture; Amplify mid-freqs
Vertical direction coding
Frequency analysis
Transduction
Outer, middle & inner ear
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Conductive hearing loss
• Sounds don’t get into cochlea
• Middle ear problems
• Helped by surgery and by amplification
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Cochlea
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Cochlea cross-section
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Organ of Corti
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Hair Cell Stereocilia
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Auditory nerve innervation
OHC (2)
spiral afferent (green)
medial efferent (red)
IHC (1)
radial afferent (blue) lateral efferent (pink)
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Inner vs Outer Hair Cells are Physiologically Different
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Travelling wave on basilar membrane sorts sounds by
frequency
distance along basilar membrane
base apex
high frequencies low frequencies
0
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