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3) Vestibular and Equilibrium

The Special Senses. 3) Vestibular and Equilibrium. 13 th edition Chapter 17 Pages 635 - 671. 12 th edition Chapter 17 Pages 598 - 633. The Special Senses. 3) Auditory. Anatomy of the ear. Anatomy of the ear. Anatomy of the ear. Anatomy of the ear. Anatomy of the ear.

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3) Vestibular and Equilibrium

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  1. The Special Senses 3) Vestibular and Equilibrium 13th edition Chapter 17 Pages 635 - 671 12th edition Chapter 17 Pages 598 - 633

  2. The Special Senses 3) Auditory

  3. Anatomy of the ear

  4. Anatomy of the ear

  5. Anatomy of the ear

  6. Anatomy of the ear

  7. Anatomy of the ear

  8. Anatomy of the ear

  9. Hearing Pathway

  10. The Vestibular System

  11. Anatomy of the ear

  12. Anatomy of the ear

  13. Anatomy of the ear

  14. Anatomy of the ear

  15. Ménière Disease Disease results from a disruption of normal endolymphvolume Symptoms include: Severe vertigo Positional nystagmus (nystagmus when head in a particular position) Nausea Affected individuals can also experience-unpredictable attacks of auditory & vestibular symptoms: Vomiting Tinnitus (ringing in ears) Inability to make head movements Inability to stand passively Low frequency hearing loss Treatment: administration of a diuretic (hydrochlorothiazide) & a salt restricted diet Persistent condition: shunt implantation into swollen endolymphatic sac, or delivery of a vestibulotoxic agents (gentamicin) into perilymph.

  16. Ampulla of Semicircular canal

  17. Rotational head movements Angular accelerations Displace endolymph in membranous ducts Push cupula to one side or other Displace stereocilia/kinocilium of hair cells in same direction Hair Cell Activation

  18. Macula and otolith organ

  19. Macula and otolith organ

  20. Equilibrium PATHWAY

  21. Vestibulospinal Network: Influences muscle tone & produces reflexive postural adjustments of the head and body vestibular nucleus Projects to all levels of the spinal cord Terminate on alpha & gamma motor neurons Excite extensor muscle motor neurons Stabilize body’s center of gravity & preserves upright posture

  22. Ménière Disease Disease results from a disruption of normal endolymphvolume Symptoms include: Severe vertigo Positional nystagmus (nystagmus when head in a particular position) Nausea Affected individuals can also experience-unpredictable attacks of auditory & vestibular symptoms: Vomiting Tinnitus (ringing in ears) Inability to make head movements Inability to stand passively Low frequency hearing loss Treatment: administration of a diuretic (hydrochlorothiazide) & a salt restricted diet Persistent condition: shunt implantation into swollen endolymphatic sac, or delivery of a vestibulotoxic agents (gentamicin) into perilymph.

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