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Physiology of Inner Ear
Dr. Sara Sadiq
(MBBS, M.Phil)
Cochlea
• A spiral shaped fluid filled
structure
• Coiled tube making 2.5 to 2.75
turns around a central pyramid
of bone  Modiolus
Physiology of Hearing
• Auricle  external auditory canal
• When sound waves strike eardrum
that cause eardrum to vibrate
• The central area of Ear drum is
connected to malleus which starts to
vibrate. The vibration is transmitted
from malleus to incus then to stapes
• As a stapes moves back and forth it
pushes the membrane of oval
window in and out
Physiology of Hearing
• The oval window bulges inward it pushes on perilymph of scala
vestibule
• The pressure waves transmitted from scala vestibuli to scala tempani
that push the vestibular membrane back and forth creating the
pressure waves in the endolymph inside the cochlear duct.
• The pressure waves in endolymph cause basilar membrane to vibrate,
which moves hair cells in the spiral organ against the tectorial
membrane
• Bending of hair cells stereocilia produces receptor potential that lead
to generation of nerve impulses
Thank You

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Physiology of inner ear

  • 1. Physiology of Inner Ear Dr. Sara Sadiq (MBBS, M.Phil)
  • 2.
  • 3. Cochlea • A spiral shaped fluid filled structure • Coiled tube making 2.5 to 2.75 turns around a central pyramid of bone  Modiolus
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20. Physiology of Hearing • Auricle  external auditory canal • When sound waves strike eardrum that cause eardrum to vibrate • The central area of Ear drum is connected to malleus which starts to vibrate. The vibration is transmitted from malleus to incus then to stapes • As a stapes moves back and forth it pushes the membrane of oval window in and out
  • 21. Physiology of Hearing • The oval window bulges inward it pushes on perilymph of scala vestibule • The pressure waves transmitted from scala vestibuli to scala tempani that push the vestibular membrane back and forth creating the pressure waves in the endolymph inside the cochlear duct. • The pressure waves in endolymph cause basilar membrane to vibrate, which moves hair cells in the spiral organ against the tectorial membrane • Bending of hair cells stereocilia produces receptor potential that lead to generation of nerve impulses