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78 True/False questions

  1. contraction of tensor tympani and stapediusit pullls footplate of stapes out of oval window, and draws stapes toward posterior wall of the middle ear


  2. the core layer has tough _______ ____ tissuefibrous connective


  3. decreasing amount of sound passed to inner earfluid


  4. stapes resembles astirrum


  5. function of eustachain tubecarries special sensory fibers for taste for anteriro 2/3 of tongue


  6. TM is attache to bony wall of ear canal by ____inward


  7. malleus' handle is calledprimitive club/mallet


  8. malleus is shaped likeprimitive club/mallet


  9. describe impedeance matching functionsound traveling from medium of low impedance (air of outer ear canal) to medium of high impedance (cochlear fluid) gets amplified thanks to lvl of action of ossicles and difference in area bw tympanic membane and oval window


  10. amplification in middle ear occurs fro frequencies bw100 Hz and 2000 Hz to 2500 Hz


  11. tympanic membrane landmarkspars flaccida
    pars tensa
    malleus (lateral process & manubrium)
    cone of light
    long process of incus


  12. osseous portion of eustachian tube is always open on ____ wall of middle earanterior


  13. tinniest bones in the bodyossicles


  14. smallest muscle in the bodyossicles


  15. middel ear muscles-impedence matching function
    -protection of inner ear structures


  16. Middle ear cavity akastapedius
    tensor tympani


  17. eustachian tubeprovide connection bw tympanic membrane and oval window


  18. epitympanic recess is filled byattic
    -extends beyond superior border of TM


  19. what's the recovery from the increase of pressure of the stapes pushing into the oval window?force cancelled at relatively large tempanic membrane, then concentrated on small area of oval window (stapes footplate), results in increased sound pressure into inner ear


  20. promontory is opposite totactile stimulation


  21. primary source of sound amplificationfootplate


  22. tensor tympani draws manubrium ____ which _____ ____ to TMmedially; applies tension


  23. stapes seals ___ in inner earCN7 facial nerve


  24. area of foot plate85% of surface area has all 3 layrs


  25. middle bone bw malleus and stapesstapedius
    tensor tympani


  26. tensor tympani attaches toupper end of malleus handle


  27. manubrium of malleus connected toTM acts like aprimitive club/mallet


  28. Oval windowboundary bw middle and inner ear; holds footplate of stapes


  29. tympanic cavity isattic
    -extends beyond superior border of TM


  30. _____ pivots around its short processincus


  31. chorda tympani passes through middle ear space from _____ part of ______ wall to _____ wall, and crosses _____ TMmedially; applies tension


  32. chorda tympani is branch ofupper end of malleus handle


  33. stapedius is attached tohead of staps


  34. promontorylocated bw windows
    -bony ridge


  35. incus' short process fits into depression on posterior wall of ____ ____ ___stapes


  36. stiffening ossicular chain and tympanic membranefluid


  37. incusconnects middle ear to nasopharyngeal cavity


  38. describe the areal ratio of tympanic membrane to stapes footplatemucosal lining of middle ear space


  39. footplate and oval window are attached byoval window


  40. tensory tympani is innervated byCN7 facial nerve


  41. upon contraction of stapedius-equalizes air pressure in middle ear to outer ear pressure
    -ventilation of middle ear cavity
    -oxygen is absorbed by mucous and blood vessels
    -drainage of middle ear secretions to prevent reflux of fluid back/up into middle ear space


  42. two thirds of tympanic membrane that is effective in vibrationmucosal lining of middle ear space


  43. posterior to tympanic cavity isirregularly shaped, tall and narro


  44. cartilaginous portion opens byyawning, swallowing, chewing


  45. eustachian tube is about ____ long1.5 in


  46. base of stapes is called3.2 smm


  47. reasons decrease force of low frequenciesit pullls footplate of stapes out of oval window, and draws stapes toward posterior wall of the middle ear


  48. medial layer of tympanic membrane is continous withmucosal lining of middle ear space


  49. cartilaginous portion opens duringyawning, swallowing, chewing


  50. ossicular chainprovide connection bw tympanic membrane and oval window


  51. ossicles are suspended from middle ear walls byligaments


  52. stapedius contracts _____ to loud soundsreflexively


  53. end of the manubrium is embedded in tympanic membrane at the _____umbo


  54. lateral layer of tympanic membrane, closest to the side of head hasepithelial cells


  55. impedence matching functionamplification of sound to comepnsate for loss of sound energy when going from air to fluid medium


  56. what is the recovery of sound of the aerial ratio of tympanic membrane to stapes footplate?25 dB of sound


  57. core layer islocated bw windows
    -bony ridge


  58. footplate sits in _____ _____ossicles


  59. epitympatic recessirregularly shaped, tall and narro


  60. incus' end of long process is attached to ___ headhead of staps


  61. pars flaccidasandwiched bw lateral and medial layer


  62. function of chorda tympaniconnects middle ear to nasopharyngeal cavity


  63. the area of the footplate is ____ times smaller than pars tensa17


  64. tympanic membrane has _____ shapecircular


  65. TM orientation in infants isperpendicular to EAC


  66. round windowboundary bw middle and inner ear; holds footplate of stapes


  67. tympanic memrane has _____ ____ colorcircular


  68. pars tensalocated bw windows
    -bony ridge


  69. TM orientation in adults isparallel to EAC


  70. tensor tympani's orginsabove eustachian tube opening


  71. tympanic membrane slightly coned ______inward


  72. lateral layer of tympanic membrane closest to side of the head is continuous with skin ofexternal auditory canal


  73. tympanic cavity has air filled cavity bwouter ear and inner ear


  74. stapedius is innervated byCN7 facial nerve


  75. boundary bw outer and middle earossicles


  76. tensor tympani contracts toCN V trigeminal


  77. middle ear functiontympanic cavity


  78. the ____ portio towards nasopharynx is normallyupper end of malleus handle