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14a vision-hearing-stability-2011 update stacy
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14a vision-hearing-stability-2011 update stacy

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Transcript

  • 1.  
  • 2. The cornea does not have any blood vessels running through it. The cornea has the largest body of nerve bundles and is extremely sensitive to pain.
  • 3. Light Receptors
    • Rod Cells
    • collects light vs. dark information
    • Cone Cells
    • collects colour information (red, blue or green)
    Receptors on the retina receive light information. rod OR cone cell interneuron occipital lobe
  • 4.  
  • 5. Cones
    • S-cones, M-cones, and L-cones, but they are also often referred to as blue cones, green cones, and red cones.
  • 6. Learning To See
    • Research Talk
  • 7. Eye Disorders
    • Clear images are seen when light is properly focused on the retina.
    • near-sightedness ( myopia )
      • eyeball is too long
      • need concave glasses (negative numbers)
    • far-sightedness ( hyperopia )
      • eyeball is too short
      • need convex glasses (positive numbers)
    • astigmatism
      • improper lens shape
      • special lens required
  • 8. normal myopia hyperopia astigmatism
  • 9. LASIK Surgery
  • 10.  
  • 11. Brains & Music
    • Video
  • 12. Hearing
    • sound waves are detected by the cochlea
  • 13. Hearing
    • sound waves hit the ear drum
    • vibration of ear drum vibrate three small bones in middle ear (malleus, incus and stapes)
    • bones tap on cochlea (which is filled with liquid)
    • cochlea is lined with ciliated cells
    • movement of cilia initiates neurons
    ciliated cells interneuron temporal lobe
  • 14. Hearing
    • Animation
  • 15. Hearing
    • we can distinguish between multiple sounds simultaneously
      • different frequencies stimulate the cilia at different parts of the cochlea
  • 16. Hearing Damage
    • overly loud noises can damage cochlear cilia
  • 17. Stability
    • semicircular canals above the cochlea contain a gel-like substance
    • otoliths – CaCO 3 granules, found upon the gel-like substance
  • 18. Stability
    • gravity causes otoliths to move and stimulate ciliated cells
    • direction of bent cilia indicate position to the brain
    • Animation
    • Remote Control Humans

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