The outer ear is called 'pinna'.It collects the sound from the surroundings. The collected sound passes through the 'auditory canal'.At the end of the auditory canal there is a thin membrane called 'ear drum' or 'tympanic membrane '.When the compression f the medium reaches the ear drum the membrane increases and ces the eardrum inward.Similarly, the eardrum moves outwards when a rarefaction reaches it.In this way the eardrum vibrates.The vibrations are amplified several times by three bones (the hammer,the anvil and stirrup)in the middle ear.The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.In the inner ear, the pressure variations are turned into electricalsignals by the 'cochlea'.These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.
In this way ear dream rates .The brati
