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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

What combination of deafness could you get?

conductive and sensorineural