2201W07earpost - (hammer) (hammer) Incus (anvil) Incus...

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Lateral rectus - CN6 (abducens):   Lesion: eye will tend to turn medially since  nothing is opposing that action.  Superior oblique - CN 4 (trochlear), Lesion: patient can’t look down when the eye is  turned medially The other 4 - CN 3 (oculomotor) Lesion: eye will tend to turn laterally since  nothing opposes it, and they won’t be able to move  the eye well in any other position  Nerve Lesions
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The Ear Lets Hear it for the Ears
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External auditory meatus sound/air Internal auditory meatus Facial and Vestibulocochlear
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Auricle or Pinna  Ceruminous glands – modified apocrine sweat  glands; ear wax  hair The Outer Ear External acoustic  meatus
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tensor tympani malleus pharyngo-tympanic tube A.K.A  eustacian tube A.K.A auditory tube incus stapes oval window round window tympanic  membrane The Middle Ear
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Stapes  Stapes  (stirrup) (stirrup) Malleus  Malleus 
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Unformatted text preview: (hammer) (hammer) Incus (anvil) Incus (anvil) The Ear Osscicles Spatial Relationships of the Middle Ear Otitis Media • more common in children, 1/3 of all pediatrician visits • chronic infection – myringotomy “ear tubes” Modiolus • Osseous spiral lamina The Inner Ear Cochlear duct (scala media) endolymph helicotrema Scala vestibuli perilymph Scala tympani perilymph Spiral organ Stapes on oval window Round window Basilar membrane Tectorial Tectorial membrane membrane Tinnitus • 20% of the population • 1/3 of people > 55 year • Causes: Loud Noise, prolonged exposure to loud noise Modiolus • Osseous spiral lamina The Inner Ear Static equilibrium & linear acceleration Macula – Sensory Epithelium Rotational Acceleration of the Head Rotational (angular) acceleration...
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This note was uploaded on 10/20/2008 for the course PTH AS 2201 taught by Professor Ward during the Fall '08 term at Missouri (Mizzou).

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2201W07earpost - (hammer) (hammer) Incus (anvil) Incus...

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