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opb353-qut > outer coat > Flashcards

outer coat Flashcards

1
Q

give overview layers of outer coat

A

conjunctival epithelium
conjunctival stroma
tenon’s capsule
episclera
episcleral vessel
scleral stroma
lamina fusca
choroid

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2
Q

what is tenon’s capsule

A

-thin, dense elastic connective tissue layer
-anchor (1.5mm posterioir to corneal margin & optic nerve head)
-pierced by (ciliary nerve and artery, optic nerve, vortex vein, extraocular muscle tendon)

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3
Q

what is the role of tenon’s capsule*

A

support position of eye in orbit
conribute to form
-medial and lateral check ligament
-suspensory ligament
-levator and superioir rectus
-orbital cavity

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4
Q

how much does sclera take up eye ball

A

5/6th

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5
Q

what is the thickest dimension of sclera, where *

A

1.0-1.35 mm, posterioir pole

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6
Q

what is the diameter of sclera

A

22-24mm

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7
Q

what are the openings of sclera

A

-anteriori scleral foramen (cornea)
-posterior scleral foramen (optic nerve)
-ciliary artery
-vortex vein

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8
Q

what is scleral spur

A

termination of sclera
form anterioir chamber angle

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9
Q

what are the structures of sclera

A

episclera - episcleral vessel
stroma
lamina fusca

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10
Q

what is the important structure in episclera

A

vascular connective tissue

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11
Q

what is iportant about scleral stroma

A

-bulk of sclera
-colagen, elastic fiber, proteoglycan
-fibroblast

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12
Q

what is lamina fusca

A

-inner most layer of sclera
-have melanocyte
-have vessel and nerve

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13
Q

what is the arrangement of sclera collagen fibril*

A

-many diameters (large)
-irregular spacing
-68% water

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14
Q

what happen in myopia sclera

A

-less interweaving fibril
-reduction of collagen content
-less thick sclera

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15
Q

blood supply of sclera

A

anterior ciliary arteries
posterioir ciliary artery

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16
Q

nerve supply of sclera

A

-few sensory nerve fiber from trigeminal nerve (short and long posterioir ciliary nerve)

17
Q

dimension of conjunctiva

A

sup = 14-16mm
inf=9-11
lat=5mm

18
Q

characteristic of marginal conj

A

meibomian gland opening

19
Q

characteristic of tarsal conj

A

highly vascular
firmly attahced to tarsal plate
stratified columnar
2-3 layers
scattered goblet cells

20
Q

characteristic of orbital

A

fold easily

21
Q

characteristic of fonical conj

A

loosely attahced to EOM and levator
a lot of goblet cell

22
Q

characteristic of bulbar conj

A

loosely attatched to tenon’s capsule

23
Q

characteristic of limbal conj *

A

-1.0-1.5 wide
-palisade of Vogt (location of stem cell)
-no goblet cell

24
Q

layer of conj and function

A

epithelium = secrete mucin

stroma
-superficial adenoid layer
-deep fibrous layer

25
Q

where is the transitional zone in conj

A

marginal conj

26
Q

preperty of transitional zone

A

-keratinised stratified squamous epithelium in skin
-non-keratinised in conj
-rare goblet cell

27
Q

characteristic of conjunctival stroma in each parts

A

thickest in fornix
tin in tarsal and bulbar

28
Q

characteris tic of superficial adenoid layer of conjunctival stroma

A

lymphocyte, mast cell
delicate connective tissue

29
Q

characteris tic of deep fibrous layer

A

have blood vessel, nerve, gland of Kraus, gland of Wolfring

30
Q

what is when conj hyperplasian and stromal oedema

A

conjunctival papillae

31
Q

conjunctival papillae common site and association

A

superiori tarsal conjunctiva
allergic reaction

32
Q

what does it called when conjunctiva is infected by virus

A

conjunctival follicle

33
Q

conjunctival innervation

A

sensory
-trigeminal, opthalmic nerve branch

autonomic (only vasculature)
-parasym = facial nerve, vasodilation
-sym = vasoconstriction

34
Q

conjunctival blood supply

A

medial and lateral palpebral artery

anterioir ciliary artery

35
Q

medial and lateral palpebral artery supply where

A

-superior marginal arcade -> marginal and tarsal
-superior peripheral arcade -> tarsal, orbital, bulbar
-inferior marginal arcade -> marginal, tarsal, bulbar

36
Q

anterioir ciliary artery supply where

A

-limbal zone
-limbal arcade ->network cap around limbus

37
Q

lymphatic supply for conj

A

lateral: superficial and deep parotid node
medial: submandibular node

38
Q

what is caruncle

A

modified skin
-sebaceous and sweat gland
-goblet cells

opb353-qut (5 decks)

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