4 Sclera And Episclera

Question 1

The diameter of the collagen fibrils in this tissue varies from __ to ____nm. They’re arranged in ________ ____ that branch and interlace

Answer 1

25-230

Irregular bundles

Question 2

The sclera appears ____ and white when healthy while the cornea is _____ when healthy

Answer 2

Opaque. Clear

Question 3

In the sclera, the lamella in the outer regions run ________ to the surface while the inner regions run _______

Answer 3

Parallel

Everywhere

Question 4

Does the sclera’s fibrils merge with EOM’s at their tendons?

Answer 4

You betcha

Question 5

Which layer of the eye has more fibroblasts, cornea or sclera?

Answer 5

Cornea

Question 6

The stromal ground substance is similar to the corneal ground substance, but contains fewer ________

Answer 6

GAGs (glycosaminoglycans)

Question 7

What is the origin of the longitudinal ciliary muscle fibers and most of the trabecular meshwork?

Answer 7

Posterior scleral spur

Question 8

Which layer is more hydrated? Cornea or sclera?

Answer 8

Cornea!

Sclera is relatively dehydrated (68%)

Question 9

The opacity of sclera depends on:

1) _______ of GAGs
2) amount of _____
3) size and distribution of ___________

Answer 9

Number

Water

Collagen fibrils

Question 10

What’s the sclera color in:

Newborn?
Connective tissue diseases?
Presence of fatty deposits?
Liver disease?

Answer 10

Bluish tint
Blue
Yellow
Yellow

Question 11

What foramen is occupied by the cornea?

What scleral foramen has the optic nerve pass through?

Answer 11

Anterior scleral foramen

Posterior scleral foramen

Question 12

The weakest part of the sclera is the ___________. It’s the “hole” where the optic nerve passes

Answer 12

Lamina Cribrosa

Question 13

Because it’s the weakest area of the outer connective tissue layer, the _________ is the area most affected by increased pressure and results in optic _____

Answer 13

Lamina cribrosa

Cupping

Question 14

Scleral Canals:

Posterior:
_ Canals for the Long Ciliary Nerves _Canals for the Long Ciliary Arteries
_-__canals for short ciliary arteries
_-__canals for short ciliary nerves

Answer 14

2
2
8-12
8-12

Question 15

Scleral canals:

Middle:
_ or more canals for vortex veins

Anterior:
_ canals for the anterior ciliary arteries

Answer 15

4

7

Question 16

Sclera’s blood supply is from small branches of ________ and choroidal vessels, and branches of the _____________ arteries

Answer 16

Episcleral

Long posterior ciliary arteries

Question 17

Posterior sclera sensory is innervated by branches of_______ while remainer is by branches of ________

Answer 17

Short ciliary nerves

Long ciliary nerves

Question 18

When somebody has progressive myopia by axial elongation results in scleral _____ and the tissue can bulge outward causing scleral ______

Answer 18

Thinning

Ectasia

Question 19

What’s a loose, vascularized, connective tissue layer that lies outside the sclera?

Answer 19

Episclera

Question 20

Are smaller episcleral vessels visible through conj?

Answer 20

NOPE

Larger ones are tho

Question 21

The episclera uses branches of the ___________ arteries to form a capillary network

Answer 21

Anterior ciliary arteries