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The Auditory Nervous System - PowerPoint by Y0H29R

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									The Auditory Nervous System



          SPA 4302
        Summer 2007
            The Neuron
                Generally:
  • Dendrites receive stim.
• Creates ______________
     – Transmitted along axon
     – Causes ____________
              ____________
     – Stimulates new neuron
The Ascending Auditory
       Pathway
 Primary Auditory Cortex



 Medial Geniculate Body


 Inferior Colliculus
 Lateral Lemniscus

 Superior Olivary Complex
 Cochlear Nucleus
 VIIIth Nerve
    The Descending Auditory
           Pathways
• ________________ Neurons
• ______________ Neurons
• Innervation of Middle Ear _____________
Olivo-Cochlear Efferent Neurons
Descending Pathways from Auditory Cortex
    Efferent
 Innervation of
Tensor Tympani
  & Stapedius
    Muscles
     Development: VIIIth N. and
   Central Auditory Nervous System
• VIIIth nerve initially:
  days 25 to 45
• Spiral Ganglion,
  Vestibular Ganglia
  identifiable by day 35
• Little else known about
  dev. of CANS
      Hearing Loss and the CANS
• VIIIth N: some SNHL, some normal
  –   ___________!
  –   ___________ SNHL, Initially high frequency
  –   Possibly poor Word Recognition
  –   ___________ Nerve Symptoms
• Disorders of the Auditory Nerve
  –   Vestibular Schwannoma
  –   _____________
  –   Multiple Sclerosis
  –   Auditory Neuropathy: a new dx category
       • Normal ________, Abnormal _______
    Disorders of the Cochlear Nuclei
• Kernicterus:
     – Result of Rh incompatibility
     – Hyperbilirubinemia
•   Cerebrovascular Accident: A brainstem stroke
•   Congenital trauma, malformation
•   Pressure (trauma, increased CSF pressure)
•   Syphilis
•   Aging
Disorders of the Higher Auditory
           Pathways
• Brainstem Tumors:
  – Intra-axial: contralateral or __________ deficits
  – Extra-axial: ____________ deficits
• Higher level lesions
  – CVA/Stroke/Aneurysm
  – produce _____________ deficits
Tests for Auditory Processing Disorder
• ______________
• Filtered Speech
• Speech with Competition
  –   _____________
  –   Competing Sentence Tests
  –   Dichotic Digits Test
  –   Staggered _________ Word Test
• Masking Level Difference Test
     Therapeutic Management
• _____________ Modifications
  – Improve Signal To Noise Ratios
  – Pre-Teaching


• ______________ Activities
  – Listening “Games”
  – Computer Based Auditory Training
• ______________ Strategies
  – Homework Buddy

								
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