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Ocular Block 7 > Vitreous Body And Relationships > Flashcards

Vitreous Body And Relationships Flashcards

1
Q

What is the anterior border of the vitreous body

A

Posterior surface of lens and retro zonular portion of the posterior chamber

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2
Q

What is the peripheral border of hte vitreous body

A

The pars plana, ora serrata and peripheral retina

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3
Q

What is the posterior border of the vitreous body

A

Posterior retina and optic disc

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4
Q

What does the center of the anterior surface of the vitreous body contain

A

The patellar fossa

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5
Q

Vitreous makes up about ______ of the entire volume of the eye

A

80%

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6
Q

What is true of all surfaces that interface with the vitreous body

A

That are all basement membranes

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7
Q

What is the basement membrane of the retina that interfaces with the vitreous body

A

Inner limiting membrnae

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8
Q

What is the basement membrane of the ciliary body that interfaces with the vitreous

A

BM of the nonpigmented epithelium

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9
Q

What is the interface of the vitreous body and the crystalline lens

A

Posterior capsule of lens

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10
Q

What is the strongest attachment of the vitreous

A

Vitreous base at the ora serrata

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11
Q

What is the order of the vitreous attachment in decreasing strength

A 
Ora serrata 
Posterior lens 
Optic disc 
Macula
Retinal vessels
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12
Q

Which has stronger vitreal attachemtns, front or back of eye

A

Front

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13
Q

Dimensions of the vitreous base

A

Extends 1.5 to 2mm anterior to the ora serrata, 1 to 3mm posterior to it, and several mm into the vitreous

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14
Q

Vitreal fibers of the vitreous base

A

Are embedded firmly in the BM of the NPE of the ciliary body and the internal limiting membrnae of the peripheral retina

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15
Q

What is the second strongest attachment of vitreous

A

Posterior lens/hyaloideocapsular ligament (of Weiger), or retrolental ligament

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16
Q

What are the dimensions of the hyaloideocapsular ligament (of weiger)

A

Annual attachment 1 to 2 mm wide and 8 to 9mm in diameter between the posteiror surface of the lens and the anterior face of the vitreous

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17
Q

Strength of the hyaloideocapsular ligament with age

A

Firm attachment site in young people, but diminishes after age

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18
Q

What is within the ring of the hyaloideocapsular ligaemnt on the lens

A

The retrolental space (of Berger). A potential space

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19
Q

What is the 3rd strongest attachment to the vitreous

A

Peripapillary adhesion

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20
Q

What happens when the peripapillary adhesion around the edge of the optic disc called

A

Weiss’ Ring

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21
Q

What is the 4th strongest attachment to the vitreous

A

The annular ring of the attachment at the macula

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22
Q

Dimensions of the vitreous attachment at the macula

A

3 to 4mm in diamter

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23
Q

When the vit real adhesions at the macula pull due to aging changes and the vitreous will not release, this tensions causes wrinkling of the retinal ILM. This wrinkling can be seen on ophthalmoscopy and has a cellophane appearance. What is this called

A

Macular pucker, epiretinal membrane, or cellophane maculopathy

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24
Q

What can a macular pucker eventually lead to

A

Macular hole

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25
Q

What is the weakest attachment at the vitreous

A

Retinal blood vessels

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26
Q

How is the vitreous attached to the retinal blood vessels

A

Fine strands that extend through the internal limiting membrnae to branch and surround the larger retinal vessels

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27
Q

The nature of retinal blood vessels attachment to the vitreous

A

“Molecular glue”

Contains a extracellular matrix-molecules, including laminitis and fibronectin, that have been identified as having adhesive properties

28
Q

Pre retinal hemorrhage

A

The “glue” may account for hemorrhages that occur when there is vitreal traction on the retina

29
Q

What if you find blood in Berger’s Space

A

Retinal detachment SOMEWHERE

30
Q

What is the shape of pre retinal hemorrhage

A

Boat shaped

31
Q

What happens in diabetic retinopathy

A

Neovascularization of retinal blood vessels can occur, these are weak and are susceptible to tearing or damage

32
Q

Neovascularization into vitreous in diabetic retinopathy

A

Vessels will grow into the vitreous body and beceom a very high risk for bleed due to the dynamic nature of the vitreous itself

33
Q

Where does blood that leaked from neovascularization go to

A

Bergers space

34
Q

What are the vitreous zones

A

Vitreous cortex
Intermediate zone
Cloquet’s canal

35
Q

Outermost vitreous zone

A

Vitreous cortex

36
Q

Inner cortex of vitreous body

A

Intermediate zone

37
Q

The center zone of the vitreous body

A

Cloquet’s Canal

38
Q

What used to run into the Cloquet’s Canal

A

Embryonic hyaloid artery used to run here

39
Q

How much collagen is in Cloquet’s Canal

A

Not much, there isn’t really vitreous here

40
Q

What is another name for the vitreous cortex

A

Hyaloid surface

41
Q

How wide is the vitreous cortex

A

100 microns

42
Q

What is the vitreous cortex composed of

A

Tightly packed collagen fibrils (type 2)

43
Q

Where does the anterior cortex lie

A

Anterior to the base and is adjacent to the ciliary body, posteiror chamber, and lens

44
Q

Where does the posterior cortex extend

A

Posterior to the base and is in contact with the retina

45
Q

Where are the transvitreal channels located

A

Vitreal cortex

46
Q

What are the transvitreal channels

A
  1. The peripapillary hole (ONH)
  2. Permacular hole (macula)
  3. Prevascular fissures (BV)
47
Q

What can the attachment points be described as

A

Channels

Where the vitreous attaches, it attaches in a ring

48
Q

When can the peripapillary hole be seen

A

When it detaches and is called the Weiss Ring

49
Q

This zone contains fine fibers that are continuous and unbranched and that run anteroposteriorly

A

Intermediate zone

50
Q

These fibers arise at the region of the vitreous base and insert into the posterior cortex

A

Intermediate zone

51
Q

The peripheral fibers parallel the cortex, where’s the more central fibers parallel Cloquet’s canal

A

Intermediate zone

52
Q

Membrane-like condensations called _______ may be differentiated as areas that have differing fiber densities in the intermediate zone

A

Vitreous tracts

53
Q

Another name for hte Cloquet’s Canal

A

Hyaloid channel or the retrolental tract

54
Q

This is located in the center of the vitreous body

A

Cloquet’s Canal

55
Q

Shape of Cloquet’s canal

A

S shaped

56
Q

What is the former site of the hyaloid artery system

A

Cloquet’s canal

57
Q

Where does the Cloquet’s canal being

A

Berger’s space

58
Q

Where does the Cloquet’s canal end

A

Area of Martegiani

59
Q

A funnel shaped space at the optic nerve head that extends forward into the vitreous to become continuous with the canal

A

Area of martegiani

60
Q

Space between anterior hyaloid membrane and post equatorial zonules. Also known as the retrozonular space

A

Canal of petit

61
Q

Space between pre and post equatorial zonules in the posteiror equatorial zonules in the posteiror chamber. Lies in front of the anterior surface of the hyaloid membrane and in front of the canal of petit

A

Canal of Hannover

62
Q

Space that lies within the annular ring formed by Wieger’s Ligament

A

Berger’s SPace

63
Q

Space formed by termination of Cloquet’s canal at the location of the vitreous optic disc

A

Area of martegiani

64
Q

Blood in Berger’s space

A

Can be seen on slit lamp. Whenever a retinal tear or detachment is suspected, blood in Berger’s space can be an indication of blood leakage into the vitreous body from some undetected location, this is seen as individual RBCs floating around in this area and can be very diffuse

65
Q

When the vitreous undergoes aging changes

A

Synchysis (liquefaction) and Synersis (shrinkage)

66
Q

PVD

A

When enough synchysis and synersis occurs, the vitreous attempts to collapse on itself. However the vitreal adhesions present early resistance but will eventually give way

Ocular Block 7 (9 decks)

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