Neuro T#4 Lec 42.txt

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Neuro T#4 Lec 42.txt
2011-04-25 20:29:01
Neuro Lec

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