First, our ears collect sound waves and then transmitted to the middle ear.
Ear drum vibrates by the sound waves and conducted and amplified the three ear bones. Then, the pressure waves will transmitted to the oval window and goes into the cochlea. Inside the cochlea, there are upper, cantral and lower canal.
The upper and lower canals contains fluid perilymph while the cantral canal contains fluid endolymph. The fluids can then vibrated and stimulate the sensory hair cells to produce nerve impulses to the brain.
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Hair cells in the Basilar Membrane inside the Cochlear Apparatus in the Internal Ear.