1. Home
  2. Flashcards
  3. Preview

331 6.1 Anatomy

  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
Author
shanamd2010
ID
136971
Card Set
331 6.1 Anatomy
Description
anatomy of auditory system
Updated

  1. Home
  2. Flashcards
  3. Preview