CM.edical Retina

Question 1

The vitreous occupies __% of the volume of the eye

Answer 1

80

Question 2

The vitreous is composed of the ff:

Answer 2

Collagen
Hyaluronic acid
water

Question 3

Firm attachments of the vitreous

Answer 3

Vitreous base (2 mm anterior and 3 mm posterior to the ora serrata)
Posterior lens capsule
Retinal vesels
Optic nerve
Macula
Chorioretinal scars

Question 4

Definition of ANNULAR GAP

Answer 4

Absence of BM between vit base and lens. This is important for diffusion between the aqueous and the vitreous compartments.

Question 5

Space formed by the posterior attachment of the vitreous to the macula

Answer 5

Premacular bursa or precortical vitreous bursa

Question 6

Vitreous liquefaction begins as early as age: __.

Answer 6

2

Question 7

Mechanisms of vitreous liquefaction:

Answer 7

Enzymatic and non-enzymatic cross-linking of collagen fibers
Free radical change
Decrease in network density of collagen fibers

Question 8

Flat posterior aspect of the ciliary body
Extends between pars plicata of the ciliary body and ora serrata
3.5 mm from the limbus
3.5-4.5 mm in width

Answer 8

Pars plana

Question 9

Histology of pars plana

Answer 9

Double layer of epithelial cells
Inner non-pigmented - contiguous with neurosensory retina
Outer pigmented - contiguous with the RPE

Question 10

Surgical importance of the pars plana

Answer 10

Provides surgical access to the vitreous and retina

Question 11

Anterior border of the neurosensory retina

Answer 11

Ora serrata

Question 12

extensions of pars plana onto the retinal side

Answer 12

ora bays

Question 13

teeth-like extensions of neurosensory retina onto pars plana

Answer 13

dentate processes

Question 14

difference between ora serrata nasally and temporally

Answer 14

smooth temporally

serrated nasally

Question 15

True or false

The ora corresponds to the insertion of the oblique muscles.

Answer 15

False

Corresponds to the insertion of the medial and lateral rectus muscles

Question 16

What is a meridional complex?

Answer 16

Meridional fold + Enlarged ciliary process. Area where tears can occur (posterior end).