Do humans have a third eyelid?

Related questions

1. How many minutes a day do you spend blinking?
2. Is the blink of an eye faster than the speed of light?
3. When should I be concerned about dilated pupils?
4. What is the normal position of the eyelids?
5. What would cause your eyelid to swell?
6. Can third nerve palsy be corrected?
7. Which muscles open the eye?
8. How do eyelids help the eyeballs?
9. Do birds have a second eyelid?
10. Which cranial nerve is responsible for closing the eyes?

Tags

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2. #which
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4. #structure
5. #gorillas
6. #semilunaris
7. #plica
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9. #vestige
10. #human
11. #other
12. #animals
13. #eyelid
14. #might
15. #membrane
16. #corner
17. #third
18. #likeness
19. #primates
20. #still
21. #nictitating