Vitreous Humor

Question 1

what is the volume of the vitreous humor

Answer 1

4mL (80% of the eye)

Question 2

what are the main functions of the vitreous humor

Answer 2

stores metabolites for the retina and lens, shock absorber and transmits and refracts light

Question 3

what is the impression in the anterior vitreous called

Answer 3

the patellar fossa

Question 4

what do all the surfaces have that interface with the vitreous

Answer 4

a basement membrane

Question 5

what are the 3 zones of the vitreous

Answer 5

cortex, intermediate zone, and cloquet’s canal

Question 6

what zone of the vitreous is the most dense

Answer 6

cortex

Question 7

what zone is the most outer area

Answer 7

the cortex

Question 8

what is another name for the cortex

Answer 8

hyaloid surface

Question 9

how thick is the cortex

Answer 9

100mm thick

Question 10

what is the vitreous base

Answer 10

the most extensive adhesion (in the ora serrata)

Question 11

which direction are the collagen fibers embedded in the vitreous base

Answer 11

perpendicular to the basement membrane of the NPE of the ciliary body

Question 12

where is the anterior cortex

Answer 12

anterior to the vitreous base and adjacent to the ciliary body, posterior chamber, and lens

Question 13

what is the attachment called between the posterior lens capsule and the anterior face of the vitreous

Answer 13

the ligamentum hyaloideacapsulare (retrolental ligament)

Question 14

does the retolental ligament weaken with age

Answer 14

yes, it is firm when young

Question 15

what is the space of Berger

Answer 15

a potential space within the center of the retolental ligament (between the lens and vitreous)

Question 16

where is the posterior cortex

Answer 16

posterior to the vitreous base and in contact with the retina

Question 17

what is the vitreoretinal interface

Answer 17

the outermost portion of the posterior cortex that contains anchoring fibrils that merge with the internal limiting membrane of the retina

Question 18

What is present after a PVD (posterior vitreal detachment)

Answer 18

a white ring presents around the optic disc called a Weiss Ring

Question 19

why does the retina hemorrhage when there is a vitreal traction

Answer 19

there are fine strands from the vitreous cortex and pass through the internal limiting membrane to surround the blood vessels

Question 20

what is inside the intermediate zone

Answer 20

fibers running anterior-posterior from vitreous base to the posterior cortex

Question 21

what is the channel called that runs through the center of the vitreous body

Answer 21

Cloquet’s canal or Hyaloid channel

Question 22

what is the space or tent of Martegiani

Answer 22

the funnel-shaped area over the optic nerve where cloquet’s canal attaches posteriorly

Question 23

what shape does the cloquet canal follow

Answer 23

an S shape (not a straight line)

Question 24

what type of vitreous are the zonules considered to be

Answer 24

tertiary vitreous (derived from NPE during embryological development)

Question 25

how much water is the vitreous made up of

Answer 25

99%

Question 26

why is the vitreous have viscoelastic properties

Answer 26

from the combination of hyaluronic acid and collagen

Question 27

what maintains the spacing of the collagen fibers in the vitreous

Answer 27

hyaluronic acid

Question 28

what happens to the vitreous as we age

Answer 28

it liquifies, more watery

Question 29

where is the strongest attachment of the vitreous base

Answer 29

in the ora serrata

Question 30

where is the vitreous attached in the eye

Answer 30

ora serrata, posterior lens, optic disc, macula and retinal vessels