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Animation: Detecting Pitch

by Pearson
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>> If we could uncoil the cochlea, we could see that it consists of upper and lower fluid-filled compartments-- the vestibular and tympanic canals, and the basilar membrane embedded in a central compartment-- the cochlear duct. The basilar membrane at the base of the cochlea towards the middle ear is stiffer than at the apical region, which is both wider and more flexible. This property causes different parts of the basilar membrane to vibrate maximally in response to different sound frequencies. The sensory hair cells in that region of the cochlea will become more active. And the brain interprets input from different regions of the basilar membrane as different pitches.
>> If we could uncoil the cochlea, we could see that it consists of upper and lower fluid-filled compartments-- the vestibular and tympanic canals, and the basilar membrane embedded in a central compartment-- the cochlear duct. The basilar membrane at the base of the cochlea towards the middle ear is stiffer than at the apical region, which is both wider and more flexible. This property causes different parts of the basilar membrane to vibrate maximally in response to different sound frequencies. The sensory hair cells in that region of the cochlea will become more active. And the brain interprets input from different regions of the basilar membrane as different pitches.