The human ear has three main parts: outer, middle and inner and we use all of them in hearing. Sound waves come in through your outer ear. They reach your middle ear, where they make your eardrum vibrate. The vibrations are transmitted through three tiny bones in your middle ear. The vibrations travel to your inner ear. The inner ear makes the nerve impulses that are sent to the brain and the brain recognizes them as sounds. The inner ear also controls balance.