4-inner ear - INNER EAR Two Halves: l Vestibular-transduces...

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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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The Endolymphatic Sac Termination of vestibular aquaduct Outside of temporal bone; next to dura mater lining of the brain Thought to maintain endolymphatic volume/pressure
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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 (80 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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IHCs, OHCs And Their Stereocilia OHCs (at top) 3, 4 or 5 rows Approx 12,000 cells 10 to 90 microns V- or W-shaped ranks of stereocilia 50 to 150 stereocilia per cell IHC (at bottom) 1 or 2 rows Approx 3,500 cells 35 microns straight line ranks of stereocilia 50 to 70 stereocilia per cell
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4-inner ear - INNER EAR Two Halves: l Vestibular-transduces...

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