3) vestibular and equilibrium the special senses 13 th edition chapter 17 pages 635 - 671 12 th...
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3) Vestibular and Equilibrium
The Special Senses
13th edition
Chapter 17
Pages
635 - 671
12th edition
Chapter 17
Pages
598 - 633
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3) Auditory
The Special Senses
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Hearing Pathway
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The Vestibular System
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Anatomy of the ear
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Ménière Disease
Disease results from a disruption of normal endolymph volume
Symptoms include: Severe vertigoPositional 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 movementsInability to stand passivelyLow frequency hearing loss
Treatment: administration of a diuretic (hydrochlorothiazide) & a salt restricted diet
Persistent condition: shunt implantation into swollen endolymphatic sac, ordelivery of a vestibulotoxic agents (gentamicin) into perilymph.
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Ampulla of Semicircular canal
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Hair Cell Activation
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
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Macula and otolith organ
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Macula and otolith organ
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Equilibrium PATHWAY
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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 & preservesupright posture
Vestibulospinal Network:Influences muscle tone & produces reflexive postural adjustments of the head and body
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Ménière Disease
Disease results from a disruption of normal endolymph volume
Symptoms include: Severe vertigoPositional 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 movementsInability to stand passivelyLow frequency hearing loss
Treatment: administration of a diuretic (hydrochlorothiazide) & a salt restricted diet
Persistent condition: shunt implantation into swollen endolymphatic sac, ordelivery of a vestibulotoxic agents (gentamicin) into perilymph.