21 Temmuz 2014 Pazartesi

Vestibular Nerve

Vestibular Nerve
Cochlear / Auditory Nerve
(CN VIII)

  • Function: hearing and equilibrium

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PHYSICAL EXAM
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  • Brainstem auditory evoked potentials (BAEP)
    • (in blue on above diagram)
    • Electrical activity in first 10 msec after "click" stimulus
    • Uses: 
      • Hearing assessment 
      • CPA lesions - decrease amplitude, increase latency I/II, increase V latency
      • Cochlear lesions - no change in wave pattern or latency
      • Intra-op monitoring
      • Brainstem function in coma
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Bone better than air
Both bone and air poor
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  • Weber Test
    • Hold tuning fork against vertex
    • Ask pt where sound is loudest






  • Pure Tone Audiometry


  • Rhinne Test
    • Hold tuning fork against mastoid bone
    • Ask pt where sound is loudest

  • Speech Audiometry




  • Stapedial Reflex Decay









  • Head thrust test
    • Head rotates to right
  • Vestibuloocular reflex / Caloric testing 
    • Cold water in left ear
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