lecture_15 - Mechanoreception Hearing Hearing and Balance...

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Mechanoreception Hearing
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Hearing and Balance Hair cells Fig. 7.2/ 6.2 Fig. 7.17/ 6.17 www.hhmi.org/news/coreydp.html
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Vertebrate inner ear 3 semicircular canals (vestibular apparatus) Involved in balance Cochlea (mammals) Involved in hearing Fig. 7.21/ 6.21
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Hearing In mammals, inner ear does sound detection Within cochlea, sound causes Oval window to vibrate Waves in fluid-filled space Vibrations in basilar membrane Hair cells to vibrate Fig. 7.20/ 6.20 Fig. 7.26/ 6.26
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Hearing Loudness Inner hair cells detect sounds Send signals to neurons Outer hair cells amplify sound Receive signals from efferent neurons Fig. 7.26/ 6.26 Fig. 7.20/ 6.20
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Location of inner vs. outer hair cells Cross-section of cochlea http://en.wikipedia.org/wiki/File:Cochlea-crosssection.png Vestibular duct Tympanic duct Cochlear duct (endolymph)
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Hearing Pitch Thickness of basilar membrane varies Different regions of the basilar membrane vibrate in response to different frequencies are innervated by different neurons Fig. 7.20/ 6.20 Fig. 7.26/ 6.26
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This note was uploaded on 11/05/2011 for the course BISC 305 taught by Professor Christians during the Fall '11 term at Simon Fraser.

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lecture_15 - Mechanoreception Hearing Hearing and Balance...

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