Biol 216 7 Senses 64-97.pdf - Terminology Scala vestibuli...

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5/20/17 1 Terminology: Scala vestibuli: vestibular canal (perilymph: rich in Na+) Scala tympani: tympanic canal (perilymph: rich in Na+) Scala media: cochlear duct (endolymph: rich in K+) 5/22/17 64 Basilar Membrane Forms part of the floor of the cochlear duct Anchors the sensory hair cells in the Organof Corti Organ of Corti: region that contains sensory hair cells that detect the sound vibrations transmitted to the inner ear. Vibrates in response to the vibrations transmittedthrough the inner ear >15,000 hair cells locatedalong the basilar membrane Synapse to afferent neurons Afferent neurons=auditory nerve à auditory center in the temporal lobe of the brain 5/22/17 65
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5/20/17 2 5/22/17 66 Organ of Corti Tectorial membrane Cochlear duct Hair cells Vestibular canal Cochlear duct Tympanic canal Basilar membrane Tympanic canal To auditory nerve Organ of Corti : located in the cochlear duct and contains sensory hair cells that detect the sound vibrations transmittedtothe inner ear. (Sometimes called: spiral organ) 5/22/17 67
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5/20/17 3 Terminology: Scala vestibuli: vestibular canal (perilymph: rich in Na+) Scala tympani: tympanic canal (perilymph: rich in Na+) Scala media: cochlear duct (endolymph: rich in K+) 5/22/17 68 Organ of Corti Is the sensory organ of hearing, which is distributed along the partition separating fluid chambers in the coiled tapered tube of the cochlea. Is the sensory epithelium, a cellular layer on the basilar membrane 5/22/17 69
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5/20/17 4 5/22/17 15-70 Detection of sound vibrations Hair cells arranged in rows. Of inner hair cells (responsible for hearing) and outer hair cells (regulate tension on basilar membrane) Hair bundle : stereocilia of one inner hair cell Tip link ( gating spring ) attaches tip of each stereocilium in a hair bundle to the side of the next longer stereocilium.
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