Uveal Tract (introduction)

Question 1

parts of uveal tract

Answer 1

1. Iris
2. Ciliary body
3. Choroid

Question 2

1. diameter of iris
2. diameter of pupil

Answer 2

diameter of iris = 11 - 14 mm
diameter of pupil = 3 - 4mm

Question 3

the iris is devided into two zones

Answer 3

Pupillary Zone: Surrounds the pupil; regulates light entry.
Ciliary Zone: Outer part of the iris; aids in accommodation and pupil dilation.

Question 4

what is the thickness of the iris

Answer 4

Average thickness: 0.5 mm
1. Thickest at
collarette
2. Thinnest at iris root

Question 5

Layers of iris

Answer 5

1. Anterior limiting layer
2. Iris sroma
3. Anterior epithelial layer
4. Posterior pigment epithelial layer

Question 6

The junction between ciliary body and choroid

Answer 6

Ora serrata

Question 7

Anatomically the ciliary body devided into 2 parts

Answer 7

Pars plicata (anteriorly)
Pars plana (posteriorly)

Question 8

Microscopically the ciliary body composed of 3 structures

Answer 8

1. Ciliary stroma
2. Ciliary muscles
3. Ciliary epithelium

Question 9

3 directions of ciliary muscles

Answer 9

1. Longitudinal (outermost)
2. Radial
3. Circular (inner most)

Question 10

Which one of the ciliary epithelium is the pigmented layer?

Answer 10

Outer layer

Question 11

Choroid extend from ___ to ___

Answer 11

Optic nerve to ora serrata

Question 12

Choroid composed of 4 layers

Answer 12

1. Suprachoroidal lamina
2. Choroid stroma
3. Choriocapillaris
4. Bruch’s membrane

Question 13

Which layer of choroid contain fenestrated capillaries

Answer 13

Choriocapillaris

Question 14

Talk about Bruch’s membrane

Answer 14

1. innermost layer
2. It’s glassy layer (so called vitreous lamina)
3. Between choroid and retina
4. regulat fluid and solute passage from the choroid to the retina.

Question 15

Causes of iris atrophy (fibrosis)

Answer 15

Acute congestive glaucoma
Trauma
Iridocyclitis