ocular anatomy - eyelid

Question 1

what are the functions of the eyelid

Answer 1

physical barrier
protective reflexes
produce components of tears
help spread and drain tears

Question 2

what are the muscles that close the eyelid

Answer 2

orbicularis oculi
corrugator supercilli
procerus

Question 3

what are the muscles that open the eyelid

Answer 3

levator palpebrae superioris
superior tarsal (muller) muscle
frontalis

Question 4

what is the efferent arm of the protective reflexes involving the eyelid

Answer 4

facial nerve (CN 7) innervating orbicularis oculi

Question 5

what role do the eyelids play in the production and distribution of tears

Answer 5

lubrication of eye = glands of eyelid produce components of tears (lipids, mucin, aqueous)

spontaneous and voluntary blinks help to spread and drain tears