4b - Middle Ear Functions Impedance Matching amplification...

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Middle Ear Functions Impedance Matching -- amplification of sounds to overcome difference in impedance between the air of EAC and the fluid of the inner ear. Filtering -- resonant frequency is approximately 1000 Hz, functions as bandpass filter. Acoustic Reflex -- Contraction of Stapedius muscle in response to loud sounds
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Two Halves: Vestibular--transduces motion and pull of gravity Cochlear--transduces sound energy (Both use Hair Cells) INNER EAR
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Subdivision into spaces containing endolymph (blue) , and spaces containing perilymph (red)
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Cochlea is Divided into 3 “Scala” Scala Vestibuli Reissner’s Membrane Scala Media Basilar Membrane Scala Tympani Helicotrema - the opening between 2 outer Scala
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Fluids filling the Inner Ear Perilymph- in S. Vestibuli and S. Tympani High Sodium / Low Potassium concentrations Low Voltage (0 to +5 mV) Endolymph- in S. Media High Potassium / Low Sodium concentrations High Positive Voltage (85 mV)
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Cross-Section of the Cochlea Third Turn Second Turn First Turn
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A Cross Section Shows the 3 Scala
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4b - Middle Ear Functions Impedance Matching amplification...

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