101Lecture12-13_2009

101Lecture12-13_2009 - Lecture Topic 12 Hearing, Chemical...

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Lecture Topic 12 Hearing, Chemical Senses The Auditory System
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The Ear Figure 6.32 Some Properties of Sound Figure 6.34
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The Cochlea Transduces Sound Figure 6.35 Cross Section of the Cochlea • Three main chambers – Scala vestibuli – Scala media – Scala tympani • The scala media is not continuous with the outer two chambers • Note the Organ of Corti in the scala media(circled) Figure 6.35 Vestibular membrane Tectorial membrane Scala media (cochlear duct) Basilar membrane Scala tympani Auditory nerve Scala vestibuli
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The Organ of Corti Figure 6.35 Morphology of an Auditory Hair Cell Figure 6.38
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Sound Waves Flex the Basilar Membrane • Wave-like movements in the perilymph defect the basilar membrane • The hair cell bundles, anchored in the tectorial membrane, bend with the motion Figure 6.37 Hair Cells are Mechanoreceptors Transduction channels are located at the tips o± the stereocilia Bending the stereocilia will open or close the channel – Toward kinocilium: depolarization – Away ±rom kinocilium: hyperpolarization Figure 6.38
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The Basilar Membrane Properties Allow Pitch Discrimination Figure 6.36 Lecture Topic 13 The Sense of Balance Chemical Senses
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101Lecture12-13_2009 - Lecture Topic 12 Hearing, Chemical...

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