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Cranial Nerve VIII
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Vestibulocochlear Nerve

Introduction

  • The acoustic nerve is divided into two parts: the cochlear nerve and the vestibular nerve. Special equipment is needed to thoroughly examine the vestibular component, but some rudimentary examination can be performed to clinically determine the need for a referral.

Tests to be performed

  • Hearing
  • Lateralization
  • Air and bone conduction
  • Vestibular
Expected findings
  • Patient hears sound at a distance (e.g., ticking watch, clinician’s voice).
  • No lateralization
  • Measurement of air-conducted sound is twice that of bone-conducted sound
  • Normal balance and equilibrium
Equipment
  • Tuning fork
  • Mechanical "ticking" watch

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Section: Cranial Nerve VIII
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