![]() ![]() The fluid within the cochlea transmits the pressure waves to the auditory nerve, which in turn, sends signals to the brain that are interpreted as sound. Since this is a closed system, when the oval window is pushed inward, the round window pushes outward. The stapes (the last bone in the chain) strikes the oval window of the cochlea. The pressure waves cause the tympanic membrane to vibrate, which causes the auditory ossicles to move simultaneously in response. Pressure waves transmitted by air or water are funneled by the pinna and the ear canal to the tympanic membrane.
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