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Contains mechanoreceptors ◦ Translate movement of air into a series of nerve impulses that the brain is able to interpret as sound Outer ear Middle ear Inner ear Pinna Auditory Cannal ◦ Tiny hairs and sweat glands (ear wax) ◦ protection Tympanic membrane (ear drum) Ossicles (3 smallest bones) ◦ Hammer (Malleus) ◦ Anvil (Incus) ◦ Stirrup (Stapes) Round window Oval window Eustachian tube ◦ Connects middle ear and nasopharynx ◦ Air pressure equalizes Cochlea ◦ hearing Vestibule ◦ Balance & equilibrium Semicircular canals ◦ Balance & equilibrium Filled with Fluid Sound waves enter the auditory canal Cause the tympanic membrane to vibrate Vibrations pass to the hammer (malleus), anvil (incus), then stirrup (stapes) causing them to move Stirrup (Stapes) pass vibration to the membrane of the oval window Vibration is then passed through the cochlea Cochlea ◦ 3 canals Vestibular canal Cochlea canal Tympanic canal Sound waves travel through the canals to basilar membrane (lower wall of cochlea canal) Hairs in cochlea combine to form spiral organ (organ of Corti) These hairs move with the vibrations of sound waves and synapse with fibres from the cochlea and auditory nerve Message is carried to the brain