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Audition- sense of hearing Parts of the ear Middle ear- chamber between the ear drum and the cochlea containing 3 tiny bones (hammer, anvil, and stirrup) concentrates the vibrations of the eardrum on the cochlea’s oval window Inner ear- the innermost part of the ear containing the cochlea, semicircular canals, and vestibular sacs Cochlea- coiled, bony, fluid- filled tube in the inner ear through which sound waves trigger neural impulses How sound is transferred Sound waves travel through auditory canal to eardrum Middle ear transmits the vibrations through the piston into the cochlea in the inner ear Vibrations cause the cochlea’s membrane to vibrate fluid inside of it Fluid ripples bend the hair cells on the nerve fibers that are part of the auditory nerve Theories Place Theory- theory that links the pitch we hear with the place where the cochlea’s membrane is stimulated Frequency theory- theory that the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, enabling us to sense pitch Hearing loss Conduction- hearing loss caused by damage to mechanical system that transfers sound waves Sensorineural- hearing loss caused by damage to cochlea’s receptor cells or the auditory nerves Ear Anatomy Ribbon candy: Sound Wave Sound waves travel through inner ear canal and cause the eardrum to vibrate, starting the audition process Amplitude Frequency Review Video