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31 Cards in this Set
- Front
- Back
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A traveling wave of ______________ Hz from sound will have displacement of the Basilar Membrane.
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400 Hz
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when stereocilium move lateral, what does that mean?
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Excitatory
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when stereocilium moves medial, what does that mean?
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Inhibitory
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What serves as amplifies of the Organ of Corti?
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Outer Hair cells
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The efferent nerve fibers to the Organ of Corti come from where?
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Superior Olivary Complex
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What is a way to sense hearing in newborns?
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Otoacuoustic emissions (20 db can be emitted)
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What would be a cause of reduced otoacoustic emissions?
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background noise
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What are the efferent fibers running to Outer Hair cells?
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Medial Olivocochlear Efferent (MO, MO, MO)
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What are the efferent fibers running to the Inner Hair cells?
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Lateral Olivocochlear Efferent (IO, IO, IO)
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What protects the oval window from harmful sound waves?
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Stapedius (innerv. by CN VII)
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What is activated bilaterally in order to protect the inner ear from harmful sounds?
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Tensor Tympani
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Where do you find the Primary Auditory Complex?
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Transverse Temporal Gyrus of Heschl (Area 41)
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Middle ear infection can cause what kind of hearing loss?
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Conductive
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Stapes bone outgrowth could cause what?
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Conductive Hearing Loss
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What is loss of ability for efficient conversion of airborne sound waves to pressure waves in the perilymph?
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Conductive Hearing Loss
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Test for Conductive hearing loss?
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Rinnes
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Test for Conductive and Sensorineural hearing loss?
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Webers
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What would a brainstem auditory evoked potential look like for someone with acoustic neuroma?
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peaks will be smaller and delayed. (looks more rounded off and not sharp and jagged)
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What is the frequency of sound waves ?
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Pitch (Hz)
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What is the most sensitive frequency used for spoken language?
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1,000-3,000 Hz
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What is the magnitude of the sound?
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Intensity
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How do you calculate decibels?
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20log P / Pi
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Upward displacement of the Basilar Membrane causes what?
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excitation b/c stereocilium move laterally
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What causes K+ sensitive channels to open and hyperpolarization to occur?
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Medial displacement of stereocilium---Inhibition.
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What part of the basilar membrane refers to HIGH frequencies?
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Basal part of Basilar Membrane
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What part of the basilar membrane refers to LOW frequencies?
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Apical part
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What hair cell does NOT have phalangeal processes?
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Inner hair cell
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What is responsible for seperating Inner and Outer Hair cells from the endolymph in scala media?
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Pillar Cells
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What are Deiter cells?
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Outer Phalangeal Cells that surround Outer Hair cells.
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What is responsible for the high K+ concentration in the scala media?
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Stria Vascularis
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Which projects ipsilaterally and which projects contralaterally, LOC or MOC?
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Lateral projects ipsi. MO projects CONTRA
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