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Chapter 9.3: The Senses

Chapter 9.3: The Senses. Taste Pathways. Facial, Glossopharyngeal and Vagus Trigeminal—gives us “peppery and spicy hot” Several thousand times more sensitive to taste when smell is involved. Vision. Accessory Structures Palpebrae —Eye lids Lubricate Free from dust Protect.

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Chapter 9.3: The Senses

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  1. Chapter 9.3: The Senses

  2. Taste Pathways • Facial, Glossopharyngeal and Vagus • Trigeminal—gives us “peppery and spicy hot” • Several thousand times more sensitive to taste when smell is involved

  3. Vision • Accessory Structures • Palpebrae—Eye lids • Lubricate • Free from dust • Protect

  4. Figure 9.8a

  5. Accessory cont… • Eyelashes • Protections

  6. Figure 9.8a

  7. Accessory cont… • Sebaceous Glands • In eyelashes • Keeps eyelids from sticking • Sty—Painful swelling • Due to bacterial infection

  8. Accessory cont… • Conjunctiva • Membrane over eye • Very sensitive • Conjunctivitis • AKA: Pinkeye • Damage/irritation to conjunctiva

  9. Accessory cont… • Lacrimal Apparatus • Produces, distributes and removes tears • Constantly “crying” • Moistens and cleans • Reduce friction • Remove debris • Prevent bacterial infection • Provide nutrients and oxygen to conjunctiva

  10. Figure 9.8b

  11. Accessory cont… • Nasolacrimal duct • Connects eye to nose

  12. Figure 9.8b

  13. Accessory cont… • Extrinsic eye muscles • Control eye position

  14. Figure 9.9a

  15. The Eye • Fibrous Tunics • Outermost layer of the eye • Support and protection • Attachment site for muscles • Assists in focusing

  16. Figure 9.10b

  17. Fibrous tunics cont… • Sclera • White of the eye • Muscles insert here

  18. Figure 9.10b

  19. Fibrous cont… • Cornea • No blood vessels • Limited repair

  20. Figure 9.10b

  21. Figure 9.10a

  22. Vascular tunics • Blood vessels for the eye • Regulates light into eye • Controls shape of lens

  23. Figure 9.10b

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