ear. outer ear function pinna external auditory meatus (canal) – ceruminous glands tympanic...
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EAREAR
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Outer EarOuter Ear
FunctionPinnaExternal auditory meatus (canal)
– Ceruminous glands
Tympanic membrane– Eardrum
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Middle EarMiddle Ear
Auditory = Eustachian tubeOssicles
– Malleus– Incus– Stapes
Oval windowRound window
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Inner EarInner Ear
Osseous labyrinth filled with perilymphMembranous labyrinth filled with
endolymph
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Inner EarInner Ear
Vestibule– Utricle– Saccule
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Inner EarInner Ear
Semicircular canals– Semicircular ducts
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Inner EarInner Ear
CochleaVestibular MembraneBasilar membraneCochlear duct (endolymph)
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Inner Ear - CochleaInner Ear - Cochlea
Scala tympaniScala vestibuliSpiral Organ = Organ of Corti
– Receptors for hearing are hair cells on the basilar membrane in the Spiral Organ
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HearingHearing
Sound transmission– Tympanic Reflex
High frequency at base of cochleaLow frequency at apex of cochlea
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HearingHearing
Auditory pathway
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HearingHearing
Pitch determination (20-20,000 cps)
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HearingHearing
Loudness 1-120 db
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HearingHearing
Localization of soundTime reaching ear and loudness for both
ears
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EquilibriumEquilibrium
Utricle and SacculeMacula = receptorOtolithLinear AccelerationLinear DecelerationHead Position
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EquilibriumEquilibrium
Semicircular ducts with ampulla- widened part
Crista – hair cellsCupula = endolymphRotational accelerationRotational decelerationVestibular nystagmus
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EquilibriumEquilibrium
Dynamic whole body equilibrium
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