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Physiology of hearing 21st july 11
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Physiology of hearing 21st july 11

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Transcript

  • 1. PHYSIOLOGICAL BASIS OF HEARING
  • 2.  
  • 3.  
  • 4.  
  • 5. FUNCTION OF EXTERNAL EAR
  • 6.  
  • 7. FUNCTION OF MIDDLE EAR
  • 8. FUNCTIONS OF MIDDLE EAR: 1. IMPEDANCE MATCHING
  • 9.
    • 1.Diameter of TM is 17 times
    • 2.ossicolar lever action increases the pressure 1.3 times
    • Total increase will be 22 times
  • 10. 2.ATTENUATION REFLEX
  • 11. STRUCTURE OF INNER EAR
  • 12.  
  • 13. FUNCTION OF INNER EAR
    • The inner ear has 2 main functions:
    • Mechanical frequency analysis:
    • 2. Sensory transduction:
    • Generated pressure waves which
    • are transformed into neural impulse.
  • 14. BASEMENT MEMBRANE 1. FREQUENCY ANALYSIS
  • 15. PLACE PRINCIPLE
  • 16. 2.SENSORY TRANSDUCTION IN INNER EAR Reticular lamina Rod of corti Pillar cell
  • 17. SENSORY TRANSDUCTION IN INNER EAR
    • Kinocilia / Stereocilia are Linked
    • Displacement Opens K + Channels
    • Depolarization -> release of glutamate
    • K + flows through cell
    • Glutamate -> increase spike rate in auditory nerve
  • 18. ENDOCOCHLEAR POTENTIAL
  • 19.  
  • 20.
    • Lesions of inner ear or
    • cochlear nuclei ,pons will
    • produce total N deafness
    • Lesions central ,cochlear
    • Nuclei primarily affect the
    • ability to localize sound
    • direction
    Primary Auditory area 41,42 Tranverse temporal gyri of Heschl
  • 21. Pathophysiology of hearing
    • Conduction deafness
    • Sensorineural deafness
  • 22.
    • Common tests differentiating b/w nerve & bone conduction
    • 1.Rinnes
    • 2.Webers
    • 3.Audiometer
  • 23. Rinnes compares AC-BC
    • Normal : AC >BC Rinnes + ve
    • Conductive deafness: BC > AC Rinnes – ve
    • Sensorinueral deafness: Reduced rinnes +ve
    • AC >BC
  • 24. Webers compares bone conduction of 2 ears,
    • Normal : centralized
    • Conductive deafness: lateralized to diseased
    • Sensorinueral deafness:lateralized to normal
  • 25. THANK YOU
  • 26.  
  • 27. TONOTOPICAL MAPPING
  • 28. br of inf col 41,42
  • 29.  
  • 30. Loss of high frequency tones in old age
  • 31. stapedius TT
  • 32.  
  • 33.