Hearing and Equilibrium 2009

Hearing and Equilibrium 2009 - Special Senses: The Ear and...

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Special Senses: The Ear and The Eye 1.The anatomy of the ear 2. Sound transmission through the ear 3. Signal transduction in the cochlear duct 4. The Vestibular System
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Special Senses The ear is the sense organ for two special senses: hearing and equilibrium . Hearing is our perception of the energy of sound waves . 1. Sound is the interpretation of the frequency, amplitude and duration of the wave High frequency waves give rise to high pitched sounds (Hz); We can hear in the range 20-20,000 Hz; hear best between 1000-3000Hz 2. Loudness is a function of intensity Sound intensity is a function of wave amplitude (decibels (dB)). An increase of 10dB corresponds to a 10-fold increase in intensity Normal conversation: 60dB; begin to damage at 80dB; concert 120dB (also influenced by individual ear sensitivity – see structure of ear )
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See Fig. 11.36
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1. Sound waves strike tympanic membrane and cause vibration 2. Energy is transferred to the 3 bones of the middle ear, which vibrate 3. Stapes is attached to oval window; vibration of oval window causes fluid waves in the cochlea 4. Fluid waves push on membranes of cochlear duct 5.Energy is transmitted across the cochlear duct, into the tympanic duct, and dissipates back to the middle ear via the round window 6. Hair cells in the cochlear duct create action potentials in the sensory neurons of the nerve Basilar membrane High K + ions helicotrema Vestibular membrane
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This note was uploaded on 10/14/2010 for the course ZOO 4125 taught by Professor Flanigan during the Fall '10 term at Univeristy of Wyoming- Laramie.

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Hearing and Equilibrium 2009 - Special Senses: The Ear and...

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