Sound waves first enter through the flap of the ear. The ear drum vibrates and causes three small bones (malleus, incus and stapes) to vibrate also afterwards. As the stapes (one of the small bones) moves, it touches the oval window which separates inner and middle ear. At this stage, the oval window fluctuations causes the sound waves to be transferred to what is called the cochlea. There are two auditory liquids inside cochlea, perilymph and endolymph. In the organ of corti (auditory receptor area) small hair cells receive vibrations from the auditory liquids and then the sound waves are sent to auditory nerve fibres where the sounds are heard.
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