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Lecturer KHOA TRAN DANG, M.D.

THE UNIVERSITY TRAINING CENTER FOR HEALTH CARE PROFESSIONALS OF HCMC. DEPARTMENT OF ANATOMY. THE EAR. Lecturer KHOA TRAN DANG, M.D. THE EAR. Outer ear Middle ear Inner ear. THE EXTERNAL EAR. Three parts of outer ear 1) Pinna 2) Ear canal 3) Ear drum

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Lecturer KHOA TRAN DANG, M.D.

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  1. THE UNIVERSITY TRAINING CENTER FOR HEALTH CARE PROFESSIONALS OF HCMC DEPARTMENT OF ANATOMY THE EAR Lecturer KHOA TRAN DANG, M.D.

  2. THE EAR Outer ear Middle ear Inner ear

  3. THE EXTERNAL EAR

  4. Three parts of outer ear 1) Pinna 2) Ear canal 3) Ear drum Major function of outer ear 1) protection 2) amplification 3) sound localization THE EXTERNAL EAR

  5. THE EXTERNAL EAR

  6. THE EXTERNAL EAR

  7. THE MIDDLE EAR

  8. THE MIDDLE EAR

  9. 1. d=10mm-10mm 2. 55-65mm2 3. 1400 (sup. wall canal) THE MIDDLE EAR

  10. THE MIDDLE EAR

  11. THE MIDDLE EAR

  12. THE MIDDLE EAR The Ossicles Malleus ——→ ←—— Incus ←—— Stapes

  13. THE INNER EAR

  14. THE INNER EAR Anatomy of Ear Inner Ear

  15. THE INNER EAR

  16. THE INNER EAR

  17. THE INNER EAR Microstructure of Cochlea Basilar ——————→ Membrane ↑ Organ of Corti ↑ Auditory Nerve → →

  18. THE INNER EAR

  19. THE INNER EAR

  20. THE INNER EAR

  21. VESTIBULAR NERVE

  22. Anatomy of Maculae Otolithic movement in one direction depolarizes vestibular nerve fibers and increases the number of action potentials generated Movement in the opposite direction hyperpolarizes vestibular nerve fibers and reduces the rate of impulse propagation The maculae respond only to changes in head position

  23. Crista Ampullaris - Dynamic Equilibrium The crista ampullaris (or crista) is located in the ampulla of each semicircular canal and responds to angular movements. Each crista has support cells and hair cells that extend into a gel-like mass called the cupula. Dendrites of vestibular nerve fibers encircle the base of the hair cells

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