Term
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Definition
| higher impedance means resists the propagation of sound more |
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Term
| three bones of the inner ear |
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Definition
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Term
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Definition
| innervated by cranial nerve VII, pulls the stapes footplate out of the oval window |
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Term
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Definition
| innervated by cranial nerve V, inserts on the malleus and increases the tautness of the ear drum when it contracts |
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Term
| acoustic reflex/attenuation reflex |
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Definition
| activation of the VIIIth cranial nerve causes the tensor tympanmi and staepedius muscle to contract, protecting the ear from very loud sounds |
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Term
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Definition
| ordinary sounds seem much louder than usual, often due to damage of the facial nerve (nerve VII) |
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Term
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Definition
| where the scala tympani and scala vestibuli communicate in the cochlea |
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Term
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Definition
| stimulus frequency is coded along the length of the basilar membrane - high frequency waves dissipate quickly, low ones travel to the floppy end of the basilar membrane |
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Term
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Definition
| inside of the hair cell is about 60 mV neative to the perilymph, or about 140 mV negative to the endolymph bathing the cilia. |
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Term
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Definition
| contain contractile proteins that emphasize the movement of the basilar membrane. positive feedback. "cochlear amplifier" |
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Term
| spontaneous otoacoustic emission |
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Definition
| when the positive feedback system going on in the ear goes wrong, sound comes out of the ear |
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Term
| transient evoked otoacoustic emissions |
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Definition
| a sharp click is presented to an ear, the click rings in the organ of corti for awhile but eventually dies down due to the intrinsic damping properties of the healthy inner ear. TEOAEs normally have a particular frequency distribution that reflects the activation of outer hair cells and the mechanics of the basilar membrane, so looking at it you can tell if a part of the organ of corti has been damaged |
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Term
| anterograde or Wallerian degeneration |
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Definition
| if a nerve is cut, the distal segment (away from the body, towards the terminals) degenerates |
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Term
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Definition
| if cut in axon is made too close to cell body, the cell body may die |
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