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Ocular Physiology > Eyelids > Flashcards

Flashcards in Eyelids Deck (85)
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1

why is the skin in the eyelids fat free

so they are lighter for the muscles to lift for how often we blink

2

what is blepharochalsis

inflammation of the eyelid

3

what type of carcinoma is related to UVR exposure

basal cell carcinoma

4

which lids (upper or lower) are affected by benign growths

both have an equal change of getting them

5

which lid (upper or lower) has a greater chance of developing a malignant tumor

the lower lid is four times more likely to get one

6

why wouldn't the upper lid be as common in getting malignant tumors

the eyebrows protect the upper lid from the sun

7

what does the levator palpebrae superioris do

elevates the upper lid (striated muscle)

8

what do the Muller muscle fibers do

modulate position of lids of the open eye

9

what marks the palpebral portion from the orbital portion of the lid

the insertion of the levator palpebrae superioris (superior palpebral sulcus)

10

when would someone have an absence of the superior palpebral sulcus

certain ethnicities will not have a distinct line or if there is ptosis (especially congenital)

11

what does the orbicularis oculi do

(striated voluntary muscle) closes the lids and helps hold the lid tightly against the eye, assists in spreading tears and flushing waste

12

what innervates the orbicularis oculi

CN 7- facial

13

what would happen if CN 7-facial of the orbicularis oculi was paralyzed

dry eye conditions, lagophthalmus (inability to close lids)

14

at what point does the levator palpebrae superioris become tendinous

as it enters the lid becoming the "aponeurosis of the levator"

15

what innervates the levator palpebrae superioris

CN 3 oculomotor nerve

16

what type of innervation does the tarsal muscle (Mullers muscle) superior and inferior have

sympathetic innervation

17

what does contraction of the tarsal muscle (mullers) do

aids the action of the levator

18

what would damage to the tarsal muscle do

damage to the sympathetic innervation causes a droopy lid (ptosis)

19

what type of tissue is in the submuscular areolar tissue

loose connective tissue between the muscle and tarsal plate (fat free)

20

what is in the fibrous layer of the eyelid

dense fibrous tissue and collagen that gives firmness and shape to lids (tarsal plate); more developed collagen in the upper lid

21

what is floppy eyelid syndrome

the upper lids are flaccid and easily everted

22

what causes floppy eyelid syndrome

decreased tarsal elastin and genetic abnormalities of collagen and elastin

23

what are the symptoms of floppy eyelid syndrome

burning and irritation, contact between eye and pillow during sleep, inadequate distribution of tear film, and meibomian gland dysfunction

24

what is floppy iris syndrome

complication during cataract surgery, floppy iris will come out of incision

25

how many cilia (eyelashes) are in the upper lid

100-150

26

how many cilia (eyelashes) are in the lower lid

50-75

27

what is the life-span of the cilia (eyelashes)

3-5 months

28

if an eyelash is forcibly removed, how long until it grows back

about 2 months

29

what is the chief secretion of the eyelid

sebum, oily material from the meibomian glands

30

how many meibomian glands are in each tarsal plate

about 30 in each tarsus