How do we Hear?

The ear is made up of 3 parts; the outer ear, the middle ear and the inner ear.
Sound is picked up by the outer ear (the pinna) and sent down the ear canal to the eardrum. Each part has a special function so we can hear. As sound is sent down the canal to the eardrum sound vibrations cause the eardrum to rock back and forth. Three tiny bones in the middle ear send the sound vibrations to the inner ear which contains over 30,000 tiny hair cells. Vibrations from the middle ear cause these hair cells to move and send a signal to the brain which is interpreted as sound.