BISC 230Lgx Lecture Notes - Lecture 10: Semicircular Canals, Eardrum, Basilar Membrane
9 Apr 2016
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Document Summary
Bypasses the cochlea, electrically simulates the auditory nerves for each corresponding frequency that is detected by a microphone. Fluid in the cochlea is much harder to move than air, so the ossicular chain concentrates the ear drum"s vibraions over the oval window"s small surface area. The round window bulges out as the oval window is pushed in. Neuron ires when hair cell ilaments open k+ ion channels. Locaion of acivated hair cells in basilar membrane: frequency (pitch) How far the basilar membrane moves up and down: amplitude of sounds (loudness) Everything is wet (luid-covered), so potassium is dissolved in the soluion. Loud sounds can break the ear drum, ossicles, or basilar membrane. Middle ear infecions: cause the ear to ill with luid, can rupture the ear drum. Throat infecions: will cause ears to hurt because luid in the throat travels up the eustachian tube. Toxins can also get into the hair cells and damage them.
