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Ocular Block 7 > Vitreous Body And Relationships > Flashcards

Vitreous Body And Relationships Flashcards

1
Q

What are the anterior borders of the vitreous body

A

Crystalline lens

Zonules

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2
Q

What is the peripheral border of the vitreous body

A

Pars plana
Ora serrata
Peripheral retina

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3
Q

What are the posterior borders of the vitreous body

A

Retina

Optic disc

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4
Q

What is the patellar fossa

A

The indentation that the lens sits in

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5
Q

The vitreous makes up what volume of the eye

A

80%

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6
Q

T/F all surfaces that interface with the vitreous are basement membranes

A

True

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7
Q

Where is the strongest attachment of the vitreous

A

At the vitreous base at ora serrata

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8
Q

What are the attachments of the vitreous from strongest to weakest

A

S. Posterior lens
Optic disc
Macula
W: retinal vessels

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9
Q

The vitreous base extends 1.5mm anterior or ora serrata

A

Know this

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10
Q

What are the vitreal fibers that form the base of the vitreous embedded in

A

Basement membrane of nonpigmented epithelium of the ciliary body
And
Internal limiting membrane of the peripheral retina

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11
Q

What is Weiger’s ligament

A

Ligament between posterior surface of lens and anterior face of the vitreous

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12
Q

Is Weiger’s ligament stronger in young children or adults

A

Young children

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13
Q

What is the name of the space that is created by ring that Weiger’s ligament makes

A

Berger’s space

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14
Q

What happens to the peripapillary adhesion with age

A

It diminishes

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15
Q

What does the annular attachment around the optic disc become when it detaches

A

Weiss’ Ring

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16
Q

What is the diameter of the annular ring of attachment at the retina

A

3-4 mm

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17
Q

What basement membrane of the retina interacts with the vitreous

A

Inner limiting membrane

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18
Q

What basement membrane of the ciliary body interacts with the vitreous

A

Non pigmented epithelium

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19
Q

What basement membrane of the lens interacts with the vitreous

A

Posterior capsule

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20
Q

What is a Macular Pucker

A

When the vitreal adhesions at macula pull due to aging and the vitreous will not release, and the tension Cassie’s wrinkling of ILM of retina

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21
Q

If a macular pucker goes untreated what can occur

A

A macular hole

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22
Q

What does the vitreous attachment to the retains blood vessels consist of

A

Fine strands that extend in to the inner limiting membrane and surround the larger retinal vessels

23
Q

What is contained in the area of the vitreal and retinal attachment site

What property does it have

A

Extracellular matrix
Laminin
Fibronectin

Adhesion properties

24
Q

What causes a pre-retinal hemorrhage

A

the strands from the retinal-vitreal attachment

Occurs when there is vitreal traction on the retina

25
Q

What can occur with diabetic retinopathy

A

Neovasculations

26
Q

What is wrong with vessels that pop up in neovascularizations

A

They are leaky and easily tear or get damaged

27
Q

What happens in neovascularizations continues and goes untreated

A

The vessels will grow into the vitreous and create a high risk for bleeding

28
Q

What are the vitreal zones (2 of each)

A

Vitreous cortex (outermost)

Intermediate zone (middle)

Cloquets canal (center zone)

29
Q

What is another name for the vitreous cortex

A

Hyaloid surface

30
Q

What is the vitreous cortex composed of

A

Tightly packed collage fibrils that ru parallel and perpendicular to the retinal surface

31
Q

Where does the vitreous cortex extend to

A

Posterior base and is in contact with retina

32
Q

The vitreal cortex has channels that appear as what

A

Holes

33
Q

What are the vitreal cortex channels

A

Prepapillary hole
Premacular hole
Prevascular fissure

34
Q

When can the prepapillary hole be seen

A

When the posterior vitreous detaches from the retina

35
Q

What is the premacular hole

A

A weak area

A region of decreased density

36
Q

What is the purpose of the prevascular fissure

A

Provide an avenue where fine fibers enter the retina and encircle retinal vessels

37
Q

What is contained n the intermediate zone

A

Fibers that are continuous and unbranched and run anterior-posteriorly

38
Q

How do he peripheral fibers of vitreous run

A

Parallel to cortex

39
Q

How do the central fibers of the intermediate zone of the vitreous run

A

Parallel to Cloquets canal

40
Q

What are vitreous tracts

A

Areas that have differing fiber densities

41
Q

What is cloquets canal also known as

A

Hyaloid channel

42
Q

Where is Cloquet’s canal located

A

In center of vitreous body

43
Q

What shape does Cloquet’s Canal have

A

S shape

44
Q

What used to be held in Cloquet’s Canal

A

The hyaloid artery system from embryological development

45
Q

Where does Cloquet’s canal terminate at

A

Area of Martegiani

46
Q

What is the canal of Petit

Retrozonular space

A

Space between anterior hyaloid membrane and post equatorial zonules

47
Q

What is the canal of Hannover

A

Space between pre and post equatorial zonules in the posterior chamber

Lies in front of canal of petit and anterior surface of hyaloid membrane

48
Q

What is Berger’s Space

A

The space that lies with the annular ring formed by Wieger’s ligament

49
Q

What is the area of Martegiani

A

Space formed by termination of Cloquets Canal where vitreous and optic disc attach

50
Q

When is blood seen in Berger’s Space

what does it indicate could be happening

A

Blood that has leaked into the vitreous body from undetected location

When retinal tear/detachment are suspect

51
Q

What is Syneresis

A

Drawing together of the particles in the gel, shrinkage of the gel

52
Q

What happens when there are a lot of Synchysis

A

The vitreous collapses on itself and the vitreal adhesions will soon give way

53
Q

what is synchesis

A

Liquefaction

Ocular Block 7 (9 decks)

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