Sclera

Question 1

Sclera

Answer 1

post 83% of CT of globe
gives eye its shape, rigidity, resistance to force
anchor for EOMs
thickest (3mm) where mm attach

Question 2

Sclera Composition

Answer 2

dense CT
collagen fibrils 25- 230nm
fibrils branch and interweave

Question 3

Scleral Histology

Answer 3

Elastic Fibers
Fibroblasts
ground substances

Question 4

Scleral Spur

Answer 4

anchoring of trabecular meshwork

Question 5

Scleral Opacity

Answer 5

more opaque with…..
less GAG
less water
greater size and distribution

Question 6

Blue Sclera

Answer 6

sclera too thin

Question 7

Yellow Sclera

Answer 7

fatty deposits

liver disease

Question 8

Anterior Scleral Foramen

Answer 8

area occupied by cornea

Question 9

Posterior Scleral Foramen

Answer 9

what optic nerve passes through

Question 10

Weakest Part of Sclera

Answer 10

where optic n passes

1mm thick

Question 11

Lamina Cribrosa

Answer 11

meshwork where optic nerves passes
weakest area of outer CT tunic
most likely to be affected by increased IOP

Question 12

Scleral Blood Supply

Answer 12

considered avascular- no capillary beds

Question 13

Scleral Innervation

Answer 13

short and long ciliary nerves

Question 14

High myopia can cause…..

Answer 14

scleral thinning, esp in post pole

tissue then bulges outward- scleral ectasia

Question 15

Episclera

Answer 15

loose, vascularized CT outer to sclera

has capillary network from ant ciliary aa