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Inner Ear PowerPoint Presentation

Inner Ear

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Inner Ear

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Presentation Transcript

  1. Inner Ear • Overview • Cochlea • Organ of Corti • Hair Cells • Basilar Membrane

  2. Inner Ear

  3. Inner Ear

  4. Membranous Labrynth

  5. Cochlea • Spiral - turban shaped • In humans • Two and a half turns • 35 mm long • 5 mm high • 9 mm diameter at base but becomes narrower at apical end.

  6. Cochlea

  7. Cochlea

  8. Cochlea (cochlear branch of the VIII nerve)

  9. Cochlea (spiral ganglion)

  10. Cochlea (modiolus)

  11. Cochlea (modiolus)

  12. Cochlea (scala vestibuli)

  13. Cochlea (scala media)

  14. Cochlea (scala tympani)

  15. Cochlear Fluids • Perilymph - scala vestibuli and scala tympani • Endolymph - scala media • Cortilymph - tunnel of corti in tunnel of corti

  16. Cochlear Fluids • Function • Deliver nutrients and removes waste from inner ear cells. • Important for transduction process between hydraulic and neural-electric energy. • Acts as a medium to transfer hydraulic vibratory motion that causes hair cell distortion.

  17. Cochlear Fluids • Perilymph • Similar to cerbrospinal fluid • Very high in Sodium (Na) • Very low in Potasium (K) • Overall has a negative ionic charge • Endolymph • Very low in Na • Very high in K • Overall has a positive ionic charge • Cortilymph • Similar to perilymph in chemical composition and ionic charge. • Possibly increases electrical charge in hair cells.

  18. Cochlea Cross-Section

  19. Cochlea Cross-Section Scala vestibuli Scala media Scala tympani

  20. Cochlea Cross-Section (scala vestibuli)

  21. Cochlea Cross-Section (scala media)

  22. Cochlea Cross-Section (scala tympani)

  23. Cochlea Cross-Section(organ of corti)

  24. Cochlea Cross-Section (Reissner’s membrane)

  25. Cochlea Cross-Section (basilar membrane)

  26. Cochlea Cross-Section

  27. Cochlea Cross-Section (spiral ligament)

  28. Cochlea Cross-Section(spiral lamina)

  29. Cochlea Cross-Section

  30. Cochlea Cross-Section

  31. Summary • You know the drill.