A&P Chapter 17 - Special Senses - EAR

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tiffanydawnn
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50175
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A&P Chapter 17 - Special Senses - EAR
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2010-11-17 10:23:35
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Chapter Special Senses EAR
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A&P Chapter 17 - Special Senses - EAR
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  1. auricle
    • elastic cartilage
    • external part of ear
  2. external auditory meatus
    • canal inside temporal bone
    • lined with hair
    • contains oil and wax glands
  3. tympanic membrane
    • ear drum
    • cone shaped structure with apex of cone pointing inwards
    • separates external and internal ear
  4. middle ear
    cavity filled with air that contains ossicles
  5. ossicles
    • bones in ear that transfer vibrations from ear drum to inner ear
    • attached by 2 mucles: tensor tympani and stapedius
  6. tensor tympani
    • muscle in middle ear
    • prevents ear drum damage from brief, loud noises
  7. stapedius
    • muscle in middle ear
    • prevents ear drum damage from long, loud noises
  8. Eustachian tube
    • connects tympanic cavity and middle ear with nasopharynx
    • equalizes air pressure on each side of ear drum to protect it
  9. inner ear
    2 labyrinths: bony and membranous
  10. bony labyrinth
    • series of cavities in temporal bone
    • lined with periosteum
    • filled with perilymph
    • 3 divisions: cochlea, semi-circular canal, vestibule
  11. cochlea
    • part of bony labyrinth
    • spiral shaped bony cavity that looks like a snail
  12. semi-circular canal
    • part of bony labyrinth
    • 3 cavities that look like half circles
  13. vestibule
    • part of bony labyrinth
    • connects cochlea and semi-circular canals
  14. membranous labyrinth
    • series of membrane type sacs inside bony labyrinth
    • filled with endolymph
    • contains cochlear duct, semi-circular duct, crista
  15. cochlear duct
    • part of membranous labyrinth
    • found in cochlea
    • contains organ of corti
  16. organ of corti
    • found in cochlea
    • major sense organ for hearing and sound
  17. semi-circular duct
    • part of membranous labyrinth
    • half circles made of membranes
  18. crista
    • found in semi-circular ducts
    • major sense organ for dynamic equilibrium
    • maintains body position, especially head in response to acceleration/deceleration
  19. cupula
    hairs and jelly-like material inside crista that respond to movements and keep head balanced
  20. utricles and saccule
    small sacs inside vestibule
  21. macula
    • sense organ in utricles and saccule
    • responsible for static equilibrium
  22. static equilibrium
    maintaining posture in the head in response to changes in body orientation
  23. otolithic membrane
    hairs and jelly like material in the macula
  24. otoliths
    • crystals covering otolithic membrane
    • sensitivity to gravity
    • always know up from down
    • maintain posture and balance

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