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Unformatted text preview: 1/31/12 1 Sequence of events • Air movement to mechanical movement • Mechanical movement to Fuid movement • ¡luid movement to membrane movement • Membrane movement to bending of hair cell • Bending of hair cell to ion Fow • Ion Fow to transmitter release • Transmitter release to action potential in auditory nerve • Cochlear ampli¢er Deafness Conductive Sensorineural Causes and symptoms Review/Help Session Wed 11:30 AM A204 Bending hair cell Pulling open gate Electrical! Chemical release Electrical to the brain! Bend –> tugging tip link –> opening of channel Endolymph (Fuid in cochlear duct) has very high K + concentration But…“Receptor potential” results in release of NT: K + comes in (depolarization), Ca ++ comes in (V-gated Ca ++ channels), NT release Auditory nerve Note: different than neurons • High external K + • no action potential Place theory of frequency coding Apex of cochlea Base of cochlea Sonogram Cochlea does ¡ourier analysis; Makes a map of sound frequency...
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This note was uploaded on 04/09/2012 for the course EXP 3202 taught by Professor Staff during the Spring '12 term at Florida State College.
- Spring '12