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28 Cards in this Set
- Front
- Back
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Human dynamic hearing range
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20 to 20,000 Hz
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The approximate size ratio between the tympanic membrane and finestra ovale is....
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20:1
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Stapedius and Tensor tympani muscles
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Attach to stapes and malleus respectively.
Contract to attenuate sound by 5dB in the middle ear reflex. The reflex is bilateral and responds to Loud, Long and Low sounds. |
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In normal ear anatomy, the cone of light seen through an otoscope below the umbo points....
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Anteriorly
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To double the perceived volume of a sound we must increase its amplitude by....
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20dB
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The threshold in a behavioral audiogram that is considered normal is...
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0
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Scala vestibuli contains...
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Perilymph (high sodium)
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Scala tympani contains...
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Perilymph (high sodium)
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Scala media contains....
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Endolymph (high potassium)
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In the hearing organ of corti motion that moves the inner hair cells followed by outer hair cells causes...
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Potassium influx and depolarization
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The auditory nerve is activated by ....
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Calcium release at the base of the hair cell
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Ion concentration is critical in the ear and is damaged in the condition known as...
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Menieres disease.
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The highest frequencies stimulate...while the lower frequecies stimulate...
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the furthest part of the hearing organ from the ossicles.
The closest part. high frequency = base low frequency = apex |
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The structures responsible for maintaining the ion gradient between the endolymph and perilymph are called....
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Stria Vascularis
and Cochlear support cells |
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Outer hair cells can alter (shorten) their conformation and amplify particular frequencies by as much as....
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50dB
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Bone is louder than air conduction on a Rinne test means......
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Conductive hearing loss
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Air is louder than bone on a Rinne test means....
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Sensorineural hearing loss
or The patient is normal |
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Patient localizes the sound to the right on a Weber test means....
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Right conductive hearing loss
or Left Sensorineural hearing loss |
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The semicircular canals in the ear are sensitive to....
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angular acceleration
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The Saccule and Utricle in the ear are sensitive to....
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Head tilt.
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Depolarization of the hair cells (uphill) in the vestibular system causes...
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Increased firing rate
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Hyperpolarization of the hair cells (downhill) in the vestibular system causes....
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Decreased firing rate
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Most sensitive range of hearing
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Roughly in the center of audible speech.
(1khz to 2khz) |
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Ratio of outer to inner hair cells.
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3:1
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What part of the Saccule is vertical?
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The macula
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The utricle senses....
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Horizontal linear motion
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The Saccule senses....
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Vertical linear motion.
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The semicircular canals sense...
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Angular motion
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