331 6.1 Anatomy

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Author:
shanamd2010
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136971
Filename:
331 6.1 Anatomy
Updated:
2012-02-22 13:27:19
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anatomy auditory system
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anatomy of auditory system
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  1. the auditory system
    location
    are
    • sits behind the eye
    • holes in the temporal bone
  2. outer ear contains
    • the pinna (auricle)
    • external auditory meatus (EAM or ear canal)
  3. ismiss
    • junction between bone and cartilage in the EAM
    • there is hair where the cartilage is but not where the bone is
  4. cirumin
    ear wax
  5. there is a ___ in the ear canal to ______
    • bend
    • protect the ear drum
  6. tympanic membrane
    ear drum
  7. draw the typanic membrane
    slide 9
  8. draw the quadrants of the tympanic membrane
    slide 10
  9. draw the middle ear
    slide 12
  10. the middle ear has
    2 fibrous layers
  11. what holds the ossicles in place
    10 ligaments and 2 muscles (tensor tympani and stapedius)
  12. eustachien tube
    location
    function
    • at the anterior wall of the middle ear
    • pressure device (not drainage)
  13. ossicles
    malleus, incus, stapes
  14. ossicles
    movement
    shape (draw)
    • 2,000/sec
    • inner places are not circular but bean shaped which makes them lighter but with the same stability
  15. the two middle ear muscles
    • these hold ossicles in place
    • tensor tympani - connected to malleus which is connected to a tympanic membrane (connected to CN V Trigeminal)
    • stapedius - connected to stapes (acoustic reflex - atomatic contraction) connected to CN VII Facial
  16. tensor tympani
    draw
    • encased in bone
    • very powerful
    • tendons slow it down
    • we cannot hear it
    • slide 15
  17. the stapedius
    draw
    • encased in bone
    • very powerful
    • tendons slow it down
    • cannot hear it
    • slide 16
  18. the bony labyrinth 3 parts
    • the semicircular canals
    • the vestibule
    • the cochlea
  19. three scala of the cochlea
    • scala vestibuli
    • scala media (membranous labyrinth)
    • scala tympani
  20. three fluids of the cochlea
    • perilymph
    • endolymph
    • cortilymph? unknown (perilymph)
  21. draw cochlea
    slide 25
  22. three membranes of the cochlea
    • Reissner's (Vestibular) membrane
    • tectorial membrane
    • basilar membrane
  23. other important structures of inner ear
    • stria vascularis
    • limbus
    • organ of corti
  24. organ of corti
    draw
    slide 28 and 29
  25. hair cells fit through
    meticular lamina
  26. afferent
    from ear to brain
  27. 95% of afferent system goes to
    hair cells
  28. # fibers/hair cell
    20 fibers / hair cell
  29. efferent
    from brain to ear
  30. afferent v. efferent neurons
    • 31,000 afferent
    • efferent 1,000
  31. central auditory system
    draw
    last slide
  32. right ear hitched to
    left brain and vice versa
  33. reticular activating system
    consciousness

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