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The Ear

The Ear. Perry C. Hanavan. Outer Ear. Peripheral Outer ear Middle ear Inner ear Auditory nerve Central Brainstem Midbrain Cerebral. Peripheral. Outer Ear - Pinna. Middle Ear - Tympanum. Middle Ear – Tympanic Membrane. Middle Ear – Ossicles. Middle Ear - Ossicles.

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The Ear

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  1. The Ear Perry C. Hanavan

  2. Outer Ear • Peripheral • Outer ear • Middle ear • Inner ear • Auditory nerve • Central • Brainstem • Midbrain • Cerebral

  3. Peripheral

  4. Outer Ear - Pinna

  5. Middle Ear - Tympanum

  6. Middle Ear – Tympanic Membrane

  7. Middle Ear – Ossicles

  8. Middle Ear - Ossicles

  9. Middle Ear – Ossicles - Malleus

  10. Middle Ear – Ossicles - Incus

  11. Middle Ear – Ossicles - Stapes

  12. Middle Ear

  13. Inner Ear - Osseous

  14. Inner Ear - Membranous

  15. Inner Ear - Labyrinth

  16. Inner Ear – Organ of Corti

  17. Cochlear Structures

  18. Inner Ear – Organ of Corti

  19. Basilar Membrane • Traveling wave

  20. Inner Ear – OHC & IHC • IHC • Non-motile • Afferent • Responds to loud sounds • OHC • Motile • Efferent • Responds to soft sounds

  21. OHCs

  22. Two Theories of Motility • Somatic prestin motor • Hair bundle motor

  23. Tip-links –Hair Bundle Motor <<<IHC OHC >>>

  24. Tip Link Structure • Tip Link Structure

  25. Hair Bundle Motor

  26. Tip-links

  27. Auditory Nerve

  28. 2 Types of Auditory Neurons Paul Fuchs YouTube Paul Fuchs YouTube Type I Type II

  29. Sup. Vest Nerve Standard ABR Facial Nerve Cross-section of Internal Auditory Canal HIGH- FREQUENCY FIBERS Acoustic Nerve Inf. Vest Nerve TUMOR The wave V latency used in the standard ABR IT5 and I-V delay measures is dominated by neural activity from the high-frequency regions of the cochlea. Thus, unless the tumor affects these high-frequency fibers sufficiently, standard ABR latencies will be normal. SmallTumor Abnormal Standard ABR Large Tumor Abnormal Standard ABR Small Tumor Normal Standard ABR

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