Flashcards in Auditory pathway Deck (45)
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31
Is the auditory pathway polysynaptic?
yes
32
Why is the auditory pathway bilateral?
so sound can be localised as it compares 2 inputs
33
What 2 inputs does the bilateral auditory pathway compare?
1. timing
2. loudness
34
How does the basillar membrane respond to sound?
different regions of the basillar membrane respond maximally to sounds of a different pitch
35
What frequency of sound does the apex of the basilar membrane respond to?
low pitch
36
Where does sound information of low pitch project to?
anterolateral part of Heschl's gyrus
37
What hemisphere houses the 2ndary auditory area?
left
38
What does the 2ndary auditory area entail? (which areas)
1. Brocas - anterior and motor production of words
2. wernickes - posterior and sensory and understanding
39
What is aphasia a result of?
results of f=damage to speech areas - broca's (non-fluent) or Wernickes (fluent)
40
What supplies wernicke's and broca's?
middle cerebral artery
41
Would a unilateral lesion have any effect on hearing?
no as the auditory pathway is bilateral however ability to localise sound may be impaired
42
What must be affected in a person who is deaf (usually in both ears)?
the peripheral part of the auditory (up to the brain stem) must be affected
43
What is conductive deafness?
defect of sound transmission up to spiral ganglion
44
What is sensorineural deafness?
defect in function of spiral ganglion or cochlear nerve
45
