BIOC32H3 Lecture Notes - Lecture 16: Perilymph, Vestibular Nuclei, Intention Tremor

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6 Feb 2016
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Inner ear cochlear-basilar membrane has a non uniform stiffness to it. Stiffness comes from the fact that there are a lot of collagen fibres in that region. In order to get that area to vibrate due to stiffness need high frequency vibration. Low frequency vibrations will only cause affect at opposite end. When we think about sounds we can"t hear then, it comes from the fact that stiffness of the membrane, you would need an even greater amount of stiffness of membrane for very high frequency (availability of stiffness "key"). Bending of hairs causes k channels to open, instead of leaving, it enters cell and triggers depolarization so that ca2+ can enter in hair cell. They are releasing glutamate , and so depolarization occurring in auditory neuron and so frequency of sound occur. Hair cells are different lengths (range) therefore if soft sound, only push tallest hair in tectorial membrane, and only few channels opening up, and so moderate everything.

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