is where the sound is changed from pressure waves to mechanical energy. The eardrum (tympanic membrane) is made of layers of skin, which are stretched tight like the top of a drum. As sound enters the ear canal, the eardrum begins vibrating sympathetically. Attached to the eardrum are three tiny bones or ossicles called the hammer (malleous), anvil (incus), and stirrup (stapes). Their job is to transfer the vibration of the eardrum to pressure waves in the inner ear. The relative area ratios (tympanic membrane to the footplate of the stapes) and lever action of the bones themselves (nearly 14:1), help to further amplify the signal, allowing humans to hear even the softest of sounds.
nerves make sounds as they transmit to the brain. The inner ear, called cochlear, is a bone maze filled with flu that houses thousands of hair follicles. The hair cells recognize waves of working pressure and transform them into electrical impulses for the brain and interpret them.