2015 Hearing & Balance

Example test questionTransduction mechanism

Critical fact iconHair cell transduction is DIRECTIONAL:
  • displacement TOWARDS THE TALLEST ROW OF STEREOCILIA (positive deflection) is DEPOLARIZING
    • in the cochlea, this corresponds to movement towards scala vestibuli
  • displacement TOWARDS THE SHORTEST ROW OF STEREOCILIA (negative deflection) is HYPERPOLARIZING
    • this corresponds to movement towards scala tympani

Recall the discussion of transduction in the sensory physiology lecture
(the auditory system was used as an example)

Stereocilia deflection
depolarization = green
hyperpolarization = grey

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Email: Dr. Janet Fitzakerley | ©2015 University of Minnesota Medical School Duluth | Last modified: 1-feb-15 3:54 PM