Neuro T#4 Lec 42.txt
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What deafness is located in the central auditory system?
What two complications are located in the peripheral auditory system?
- 1) Conductive deafness
- 2) Sensorineural deafness
Where is conductive deafness located?
Where is sensorineural deafness located?
What kind of damage causes conductive deafness?
- cerumen (ear wax) in external ear
- tympanic perforation
- otosclerosis (ossification)
Can a person still hear with conductive deafness?
Yes, due to intact bone that still vibrates
What causes sensorineural deafness?
- loud sounds
- head trauma
What is a vestibular schwannoma and where is it located?
- Neuroma causes by Oligodendrocytes and Schwann cells merging
- Occurs in the IAM
When placing a cochlear implant, what window should it pass: oval or round?
How do OHCs move when hyperpolarized and depolarized?
- Hyper: Extend
- Depolarized: shorten
What are otoacoustic emissions?
- Testing infant hearing
- Place microphone in EAM and measure movements of OHCs
What are the principal jobs of the OHCs and IHCs?
- OHCs: cochlear amplification
- IHCs: sensory receptors
What is the function of MSO olivocochlear efferents on OHCs?
Provide inhibition to dampen some IHCs and help with the cocktail effect
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