lecture2.ear.txt

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hhc1114
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146237
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lecture2.ear.txt
Updated:
2012-04-07 13:36:05
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anatomy
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anatomy, unit 2, lecture 11, ear
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  1. Name the 3 parts of the Ear and its 3 functions?
    • Parts
    • 1. OUTER EAR
    • 2. MIDDLE EAR
    • 3. INNER EAR

    • Functions
    • 1. Hearing
    • 2. Balance
    • 3. Equilibrium
  2. The OUTER EAR consists of 2 parts. What are they?
    • 1. The PINNA
    • 2. EXTERNAL AUDITORY CANAL
  3. What is the PINNA made up of and what is its function?
    The pinna is the cartilage of the ear; it acts as a funnel to capture the sound.
  4. Transmission of sound vibrations through the OUTER EAR occurs through what substance?
    Air.
  5. What is the middle ear normally filled with?
    Air.
  6. The middle ear is open to the nasopharynx by way of what structure and what is its function?
    • AUDITORY TUBE
    • The function of the auditory tube is to equalize the pressure of the middle ear and the outside air, so the ear bones can vibrate.
  7. What 3 bones are attached to the tympanic membrane and what is their function?
    • 1. MALLEUS (hammer). The malleus vibrates the incus
    • 2. INCUS (anvil). Vibrates the stapes
    • 3. STAPES (stirrup). Their function is to amplify sound vibrations.
  8. The INNER EAR is in what portion of the skull?
    The temporal bone (petrious portion).
  9. Bony Labyrinth is filled with what fluid?
    Bony Labyrinth is filled with PERILYMPH
  10. What fluid is in the MEMBRANOUS LABYRINTH?
    ENDOLYMPH.
  11. What structure contains receptors for hearing?
    COCHLEA
  12. What 3 structures are responsible for balance?
    • 1. Semicircular Canals
    • 2. Utricle
    • 3. Saccule
  13. Semicircular Canals
    • A. Superior
    • B. Posterior
    • C. Lateral
    • D. Stapes
    • E. Cochlea
    • F. Vestibulocochle ar nerve
    • G. Saccule
    • H. Utricle
  14. Where are hair cells found?
    Hair cells are receptor cells for what 2 things?
    • Cochlea and Semicircular Canals
    • Hearing and equilibrium
  15. What cranial nerve carries information for hearing?
    CN VIII VESTIBULAR COCHLEAR NERVE
  16. What is the stapes is attached to?
    OVAL WINDOW
  17. What structure determines movement in three planes?
    SEMI-CIRCULAR CANALS
  18. What are the two joined structures attached to the semi-circular canals?
    UTRICLE and the SACCULE.
  19. What type of fluid and what receptors are within each semi-circular canal?
    Endolymph and hair cells.
  20. What are calcium deposits in the inner ear called?
    They are an essential part of the utricle and saccule for what purpose?
    • OTOLITHS (ear rocks)
    • Equilibrium
  21. How is the Otoliths play an essential process in stimulating the hair cells?
    It allows the hair cells in this region to act as receptors by telling you what position your head is in and provide you a sense of equilibrium.
  22. What is VERTIGO or LABYRINTHITIS?
    Inflammation of the semi-circular canals that give a sense of motion when you're not moving. This can be debilitating.

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