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anatomy and physiology of the sensory auditory mechanism
objectives (1) anatomy of the inner ear
functions of the cochlear and vestibular systems
three compartments within the cochlea and membranes
branches and function of cranial nerve viii function of the hair cells transitional pathways
otoacoustic emissions, and spontaneous emissions
electrochemical makeup of the cochlea cochlear electrophysiology tuning curves inner ear (1) inner ear: a fluid-filled series of canals labyrinth because of its mazelike arrangement
cochlea, semicircular canals, vestibule, utricle, saccule, and cochlear duct
the inner ear:
vestibular: the sense of balance and spatial orientation
cochlear: hearing oval window and round window scala vestibuli, scala media, scala tympani reissner¡¯s membrane and basilar membrane
organ of corti (outer hair cell and inner hair cells)
inner ear (2)
function of the cochlea: to convert mechanical energy to electrical energy (electrochemical energy)
three compartments of the cochlea, the fluid, and the chemical component
scala vestibuli-perilymph-high sodium and low potassium
scala media-endolymph-low sodium and high potassium
scala tympani-perilymphhigh sodium and low potassium
stria vascularis: responsible for the generation of the endocochlear potential, a resting potential that is critical to the function of the inner ear and for the secretion of endolymph.
inner ear (3) difference between ihcs and ohcs
ihcs: flask-shaped while ohcs:cylindric shaped
ihcs: one low while ohcs: three lows
streocilia of ihcs:-shaped while that of ohcs:v shaped
ihcs role: transmit auditory information to the brain (ascendingafferent) while ohcs role: receives auditory information from the brain (descendingefferent) and terminates the efferent pathways from the brain
afferent pathway and efferent pathway
afferent (ascending) pathway: from the inner hair cells to the brain
efferent (descending) pathway: from the superior olivary complex of the brain to the outer hair cells of the cochlea
inner ear (4)
structures and functions of the basilar membrane: (ÀÌÇÏ »ý·«)
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