Special Senses

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Special Senses

• ANP 128

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• OBJECTIVES
• 1. Know the structure of the eye, ear, nose and
  taste.
• 2. How are cranial nerves involved in special
  senses?
• 3. Explain how light waves are transformed into
  images in the brain.
• 4. What is the route taken by sound waves to
  travel from the exterior to the brain?
• 5. How are taste sensations and smell sensations
  similar and different?

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Vision
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Vision
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Vision
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Vision
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Vision
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Vision
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Hearing
External Pinna External Auditory canal Tympanic
membrane Ceruminous glands Middle Eustachian
tube Ossicles oval window round window
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Hearing

• Inner
• Bony labyrinth
• Membranous labyrinth
• Vestibule
• utricle
• saccule
• Semicircular canals
• Cochlea

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Hearing
How are we able to hear sounds of different
loudness and pitch? What are some clinical
aspect of hearing that you know about? What goes
wrong? How do you treat hearing loss?
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Hearing and Balance
http//www.dizziness-and-balance.com/anatomy/Vesti
bular-Nerve.gif
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Olfaction
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Olfaction
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Taste
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Taste
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Taste

• Four tastes
• sweet, sour, salty, bitter zones
• Adaptations - 1-5 minutes
• thresholds vary with taste

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• Questions?