LAB 15

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LAB 15
2013-03-06 20:59:55
Lab 15 Ear

The Ear
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  1. external ear
    • the organ located on the dis of the head that receives sound vibrations and channels them to the tympanic membrane
    • consists of pinna and external acoustic meatus
  2. pinna
    also called auricle; the flexible structure supported by the auricular cartilage
  3. auricular concha
    the hollow of the ear, which is incompletely divided by the crus of the helix
  4. cartilaginous external acoustic meatus
    • lines the external acoustic meatus of the temporal bone
    • conducts sound vibrations from the auricle to the middle ear
  5. cerumen
    earwax; keeps tympani membrane pliable
  6. middle ear
    consists of tympanic membrane, the air-filled tympanic cavity, and the auditory tube
  7. tympanic membrane 3 layers
    skin (externally); conn. t.p.; and mucous membrane (deep side)
  8. wall which separates tympanic cavity from inner ear
    labyrinthine wall of tympanic cavity; two openings: oval-shaped vestibular window of the temporal bone and round-shaped cochlear window of the temporal bone 
  9. wall in tympanic cavity which opens into auditory tube
    carotid wall
  10. the opening into the pharynx (by the auditory tube)
    pharyngeal opening of auditory tube
  11. tensor tympani m.
    • dampens vibrations of excessive amplitude to protect the delicate structures of the inner ear from damage
    • origin: cartilaginous part of auditory tube
    • insertion: malleus
  12. osseous labyrinth of the temporal bone vs. membranous labyrinth
    • the osseous labyrinth of the temporal bone is a set of BONY CHANNELS within the pertrous part of temporal bone (NOT PART OF EAR)
    • the membranous labyrinth are the components of the inner ear which are WITHIN the osseous labyrinth