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abstract acoustic anatomy anvil art auditory body bone bones brain canal canals cavity cells circular clip cochlea collect collecting cross curve curved drawing drum ear eardrum encased eustachian external fluid hammer hear hearing human illustration inner internal listen medical membrane microscopic middle nerve organ ossicles outer part parts pinna produce promontory protect row science scientific section semicircular sense sensory shake signal skin skull snail sound stapes sticking stirrup symbol throat tiny tube vestibular vestibule vibrates vibration waves