AN SC 310 - 11

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Author:
ebacker
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188335
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AN SC 310 - 11
Updated:
2012-12-12 13:21:17
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AN SC 310
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Description:
Lecture 11 - The Ear and Hearing
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  1. What are the 3 major parts of the ear?
    • Outer ear - entry of sound waves
    • Middle ear - amplification of waves
    • Inner ear - transduction (E to APs)
    • 1. Pinna
    • 2. External auditory meatus
    • 3. Tympanic membrane
    • 4. Ossicles
    • 4.1 Malleus
    • 4.2 Incus
    • 4.3 Stapes
    • 5. Oval window
    • 6. Round window
    • 7. Cochlea
    • 8. Vestibular apparatus
    • 9. Eustachian tube
  2. How are sound waves amplified in the ear?
    • Sound waves strike tympanic membrane
    • Ossicle movement (1st lvl amplification)
    • Oval window movement (2nd lvl amplication)
  3. Where does signal transduction for sound occur?
    Cochlea
  4. What are the fluids in the cochlea and where are they located?
    • Perilymph - scala vestibuli, scala tympani
    • Endolymph - scala media
  5. What is the mechanism of sound transduction?
    Stereocilia - connected by protein bridges, mechanical stress moves bridges which opens/closes cation channels
  6. When stereocilia bend, what happens?
    • Bend toward tall stereocilia = depolarization = APs
    • Bend toward short stereocilia = hyperpolarization = no APs
  7. What are the 3 semicircular canals and what mvmt do they detect?
    • Anterior canal - "yes"
    • Posterior canal - "ear to shoulder"
    • Lateral canal - "no"
  8. Where are the receptor cells in the semicircular canals located?
    Ampulla
  9. What is the name of the tallest stereocilia?
    Kinocilium
  10. What does the utricle detect?
    Forward/backward acceleration
  11. What does the saccule detect
    Up/down acceleration
  12. What are the 2 branches of the vestibulocochlear nerver (cranial nerve VIII)?
    • Vestibular nerve for equilibrium
    • Cochlear nerve for hearing

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