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opb353-qut > eyelids > Flashcards

eyelids Flashcards

(56 cards)

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1
Q

4 layers of eyebrows

A

Skin
Subcutaneous tissue
Muscle layer
Submuscular areolar layer

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2
Q

4 muscle acting on eye brows and function

A

Orbicularis oculi
* orbital portion → Firm lid closure, draws forehead skin medially, depresses

Corrugator
* Draws brows and lids medially

Frontalis
* Elevates brow, draws scalp forward

Procerus
* Draws brows and lids medially

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3
Q

what is tarsal plate and function

A

Dense connective tissue, primarily collagen

Gives structural rigidity
* Extend width of lids, curve
to fit contour of globe

Folds and furrows

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4
Q

how many folds of eyelids

A

superior palpebral sulcus
inferior palpebral sulcus
malar suclus
nasojugal sulcus

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5
Q

width and height of tarsla plate

A

width = 29mm
height = 10mm upper, 5mm lower

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6
Q

name of meibomian test

A

meibography

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7
Q

muscle of eyelid clsoing

A

OO
-orbital
-pretarsal
-preseptal
-marginal (riolan)
-lacrimal (horner)

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8
Q

what anchor oo to orbit

A

medial and lateral palpebral ligament

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9
Q

what muscle help meibomian secretion

A

-pretarsal
-marginal (riolan)

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10
Q

how many eyelash in upper and lower

A

100 up, 50 dowm

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11
Q

what is conjunctiva

A

muscous membrane

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12
Q

zone of conjunctiva

A

palpebral
-marginal
-tarsal
-orbital

fornix

bulbar
-limbal
-scleral

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13
Q

whta is plica semilunaris

A

fold of conjunctiva

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14
Q

describe rtery in eyelids

A

lateral and medial palpebral artery
-> form peripheral and marginal (palpebral) arcade [upper]
-> only marginal [lower]

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15
Q

lyphatic drainage

A

lateral: preauricular, parotid node
medial: submandibular node

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16
Q

what CN nerve is somatosensory nerve of eyelid

A

trigeminal (V)

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17
Q

eye lid nerve from big -> small

A

trigeminal
-ophthalmic -> lacrimal, supraorbital, supratrochlear (upper lid)
-maxillary ->infraorbital (lower lid)
-mandibular

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18
Q

function of eyelids

A

-mechanical defense
-prevent xerosis (dry eye)
-reduction of visual stimuli
-spread tear eveny
-corneal nutrition and gas exchange (contactlens)

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19
Q

normal growth cycle of cilia

A

3-5months, quicker when removed

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20
Q

why we blink when we touch eyelash

A

neural plexus

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21
Q

function o fcilia

A

protect ocualr surface, tear eveporatio reduction

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22
Q

what it the flaws of eyelash

A

trichiasis

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23
Q

length and width of palpebral aperture, and upper lid

Study These Flashcards
A

length = 29mm, width = 9.5mm
1mm upper lid overlap

24
Q

exophthalmus and endolphthalmus

Study These Flashcards
A

forward and backward protrusion of the globe

25
where does lid contact
lid wiper, posterioir to marx's line
26
how lid maintain appositio to globe
-tarsal plate curve to contour globe -muscle of riolan (marginal OO) -medial and lateral palpebral ligament
27
eyelid pressure on the globe
8.0+-3.4mmHg
28
width of region of contact between lid margin and ocular surface
0.6+-0.16mm
29
what is ectropian and entropian
lid margin turn away from or turn in to the globe
30
lid wiper epitheliopathy
alteration to epithelial cell of lid margin
31
how can we diagnose lid wiper epitheliopathy
lissamine green or rose bengal staining on lid wiper region
32
what lid wiper epitheliopathy associate with
dry eye
33
what muscle use for inferiioir eye opening
tarsal muscle only
34
why upper lid follow globe movement
relatioship between levator and superiori rectus muscle
35
what pretarsal, preseptal, and orbital OO involved in blink
pretarsal -spontaneous and reflex blink preseptal -blink and sustained activity orbital -sustai activity
36
what make lid close
gravity relaxation of levator contraction of OO
37
what is it celled when levator relax but OO contract
reciprocal inhibition
38
how uppr and lower eye lid move
* Greater movement in upper lid than lower lid * Upper lid moves downwards, but slightly nasal * Lower lid primarily moves horizontally (nasally) * Closing phase faster than opening phase
39
movement of eye when blink
Rotations retraction -draw back
40
rotation of eye difference *
Rotations : * Normal blinks -Slight down and in movement * Forced Blinks -Large upward and outward movement (Bell’s phenomenon)
41
what is the condition that patient can't close eye
bells palsy (facial nerve palsy)
42
classes of lid closure *
voluntary -bilateral (blink) -unilateral (wink) involuntary -spontaneous -reflex -blepharospasm
43
reflex vs spontaneous vs blepharospasm *
reflex - trigger by external stimulus spontaneous - no external stimuli blepharospasm - involuntary forcible eyelid closure
44
type of reflex blink *
touch dazzle menace
45
flex blink - touch (pathway) *
afferent = trigeminal nerve efferent = facial nerve
46
dazzle *
bright light afferent=optic nerve efferent=facial nerve
47
menace *
thing that is likely to cause harm afferent = optic nerve (more visual process) efferent = facial nerve
48
spontaneous*
no external stimuli, not require visual input -> maintain tear film
49
frequency of spontaneous blink
14 blinks/min
50
interblink
5 seconds
51
what can affect blink rate
-contactlens -age -temp -ocular dryness, stability of tear film -visual task -emotional stage -light level -neurological issue
52
how neurological issue relate to spontaneous blink rate
increase dopamine level -> increase blink rate and vice versa
53
type of spontaneous blink
complete incomplete twitch
54
what is visual suppression*
* Vision is suppressed during blink * Allows for smooth visual information
55
what happen to eye lid when sleep
relax = levator na dtarsal tonic stimulatio of OO
56
what is t called when incomplete closure eyelid while sleeping
nocturnal lagophthalmus

opb353-qut (5 decks)

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