III11 - cochlear nerve impulses -> to brain IV....

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Physiology of Hearing and Equilibrium III. A. Resonance of Basilar Membrane 1. vibration of oval window -> perilymph vibration 2. for 20 - 20,000 Hz only, vibration of vestibular membrane 3. vestibular membrane vibration -> endolymph vibration 4. endolymph vibration -> vibration of basilar membrane 5. basilar membrane “fibers” of different length, thickness, and tension like strings of a piano a. resonance - different fibers of basilar membrane have different “natural frequencies” b. SPECIFIC parts of basilar membrane vibrate only at SPECIFIC frequency (pitch) B. Excitation of Hairs Cells of Organ of Corti 1. cochlear hair cells - rest on the basilar membrane, contain "stereocilia" which project into the "tectorial membrane" just above a. basilar m. vibration -> hair cell vibration b. hair cell vibration -> opening/closing channels c. depolarization/hyperpolar -> cochlear nerve d.
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Unformatted text preview: cochlear nerve impulses -> to brain IV. Anatomical Pathway to the Brain cochlear nerve (vestibulocochlear VIII)-> spiral ganglion --> cochlear nuclei (medulla) --> superior olivary nucleus --> lateral lemniscal tract --> inferior colliculus --> medial geniculate body of thalamus --> auditory cortex (superior temporal lobe) V. Processing of Auditory Information A. Perceiving Pitch (Frequency) - location of vibration on the basilar membrane B. Perceiving Differences in Loudness (Intensity) - amplitude increases, more hair cells of the basilar membrane (with same pitch) are activated Physiology of Hearing and Equilibrium C. localizing Source of Sound 1. superior olivary nucleus - first point where sound from both ears come together a. relative intensity - the amplitude of sound waves hitting the different ears b. relative timing - the difference in timing in which a sound reaches both ears...
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III11 - cochlear nerve impulses -> to brain IV....

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