outer coat

Question 1

give overview layers of outer coat

Answer 1

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

Question 2

what is tenon’s capsule

Answer 2

-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)

Question 3

what is the role of tenon’s capsule*

Answer 3

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

Question 4

how much does sclera take up eye ball

Answer 4

5/6th

Question 5

what is the thickest dimension of sclera, where *

Answer 5

1.0-1.35 mm, posterioir pole

Question 6

what is the diameter of sclera

Answer 6

22-24mm

Question 7

what are the openings of sclera

Answer 7

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

Question 8

what is scleral spur

Answer 8

termination of sclera
form anterioir chamber angle

Question 9

what are the structures of sclera

Answer 9

episclera - episcleral vessel
stroma
lamina fusca

Question 10

what is the important structure in episclera

Answer 10

vascular connective tissue

Question 11

what is iportant about scleral stroma

Answer 11

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

Question 12

what is lamina fusca

Answer 12

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

Question 13

what is the arrangement of sclera collagen fibril*

Answer 13

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

Question 14

what happen in myopia sclera

Answer 14

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

Question 15

blood supply of sclera

Answer 15

anterior ciliary arteries
posterioir ciliary artery

Question 16

nerve supply of sclera

Answer 16

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

Question 17

dimension of conjunctiva

Answer 17

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

Question 18

characteristic of marginal conj

Answer 18

meibomian gland opening

Question 19

characteristic of tarsal conj

Answer 19

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

Question 20

characteristic of orbital

Answer 20

fold easily

Question 21

characteristic of fonical conj

Answer 21

loosely attahced to EOM and levator
a lot of goblet cell

Question 22

characteristic of bulbar conj

Answer 22

loosely attatched to tenon’s capsule

Question 23

characteristic of limbal conj *

Answer 23

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

Question 24

layer of conj and function

Answer 24

epithelium = secrete mucin

stroma
-superficial adenoid layer
-deep fibrous layer

Question 25

where is the transitional zone in conj

Answer 25

marginal conj

Question 26

preperty of transitional zone

Answer 26

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

Question 27

characteristic of conjunctival stroma in each parts

Answer 27

thickest in fornix tin in tarsal and bulbar

Question 28

characteris tic of superficial adenoid layer of conjunctival stroma

Answer 28

lymphocyte, mast cell delicate connective tissue

Question 29

characteris tic of deep fibrous layer

Answer 29

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

Question 30

what is when conj hyperplasian and stromal oedema

Answer 30

conjunctival papillae

Question 31

conjunctival papillae common site and association

Answer 31

superiori tarsal conjunctiva allergic reaction

Question 32

what does it called when conjunctiva is infected by virus

Answer 32

conjunctival follicle

Question 33

conjunctival innervation

Answer 33

sensory -trigeminal, opthalmic nerve branch autonomic (only vasculature) -parasym = facial nerve, vasodilation -sym = vasoconstriction

Question 34

conjunctival blood supply

Answer 34

medial and lateral palpebral artery anterioir ciliary artery

Question 35

medial and lateral palpebral artery supply where

Answer 35

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

Question 36

anterioir ciliary artery supply where

Answer 36

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

Question 37

lymphatic supply for conj

Answer 37

lateral: superficial and deep parotid node medial: submandibular node

Question 38

what is caruncle

Answer 38

modified skin -sebaceous and sweat gland -goblet cells