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

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

12. 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

13. Figure 9.8b

14. Accessory cont… Nasolacrimal duct Connects eye to nose

15. Figure 9.8b

16. Accessory cont… Extrinsic eye muscles Control eye position

17. Figure 9.9a

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

19. Figure 9.10b

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

21. Figure 9.10b

22. Fibrous cont… Cornea No blood vessels Limited repair

23. Figure 9.10b

24. Figure 9.10a

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

26. Figure 9.10b