Did humans use a third eyelid?

Related questions

1. Is the blink of an eye faster than the speed of light?
2. How many minutes a day do you spend blinking?
3. What is lower eyelid called?
4. Do humans have two eyelids?
5. How do you test vagus nerve?
6. How many eyelashes do humans have?
7. How many minutes a year are your eyes closed just from blinking?
8. Does blepharitis go away on its own?
9. Which among the following is vestigial organs in man?
10. Do humans have a third eyelid?

Tags

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4. #wisconsin
5. #wisdom
6. #third
7. #human
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11. #eyelid
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13. #inner
14. #madison
15. #called
16. #regarded
17. #teeth
18. #nictitating
19. #curiosity
20. #palpebra
21. #veterinarian
22. #known
23. #properly