fundies-ch7rev - CHAPTER 7 Structure of the Inner Ear and...

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CHAPTER 7 Structure of the Inner Ear and Its Mechanical Response
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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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Within S. Media is the Organ of Corti
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I = Inner Hair Cells P = Pillar Cells O = Outer Hair Cells D = Deiter’s Cells
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The Stereocilia on IHCs and OHCs OHCs (at top) V or W shaped ranks IHC (at bottom) straight line ranks
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This note was uploaded on 08/23/2011 for the course SPA 3032 taught by Professor Gerhardt during the Spring '08 term at University of Florida.

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fundies-ch7rev - CHAPTER 7 Structure of the Inner Ear and...

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