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Ocular 7 > Vitreous Body Is A 10/10 > Flashcards

Vitreous Body Is A 10/10 Flashcards

1
Q

What makes up about 80% of the entire volume of the eye?

A

Vitreous

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2
Q

What are the borders of the vitreous body ANTERIORLY?

A
  • posterior surface of the crystalline lens

- retro-zonular portion of the posterior chamber

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3
Q

What are the borders of the vitreous body PERIPHERALLY?

A
  • pars plana
  • ora serrata
  • peripheral retina
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4
Q

What are the borders of the vitreous body POSTERIORLY?-

A
  • posterior retina
  • optic disc
  • macula
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5
Q

What is the patellar fossa?

A

-invention on the anterior surface of the vitreous body in which the lens sits

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6
Q

All of the structures that interface with the vitreous are what? Name them

A

Basement membranes

  1. Retina: inner limiting membrane
  2. Ciliary body: nonpigmented ciliary epithelium
  3. Crystalline lens: lens capsule
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7
Q

Where is the strongest vitreous attachment?

A

-at the vitreous base located at the ora serrata

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8
Q

Why is the attachment at the vitreous base so strong?

A
  • the vitreal fibers are embedded in the NPCE and ILM

- there is more collagen on the periphery which allows for stronger attachement

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9
Q

Where does the vitreous base extend to?

A
  • 2mm anterior to the ora serrata
  • 1-3mm posterior to the ora serrata
  • several mm into the vitreous
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10
Q

What is the order of vitreous attachments from strongest to weakest? Is there a trend?

A
  1. Vitreous base
  2. Posterior lens
  3. Optic disc
  4. Macula
  5. Retinal vessels

-the more anterior, the stronger the attachment

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11
Q

What forms the angular attachment at the posterior surface of the lens? What are its dimensions?

A
  • the hyaloideocapsular ligament (of Weiger)/retrolental ligament
  • 1-2mm wide, 8-9mm in diameter
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12
Q

What is the retrolental space/Berger’s space?

A

-potential space in the ring of weiger’s ligament that is present because the lens and the vitreous are juxtaposed, not joined

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13
Q

Describe the attachment at the optic disc and Weiss’ ring

A
  • peripapillary adhesion around edges of the optic disc

- Weiss’ ring is when it detaches and becomes visible

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14
Q

What are the dimensions of the attachments at the macula?

A

3-4mm

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15
Q

What is a macular pucker?

A
  • when the vitreous attachment at the macula pulls but does not release fully
  • this causes tensions and makes a wrinkle of the inner limiting membrane of the retina
  • can eventually lead to a macular hole
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16
Q

Describe the attachment at the retinal vessels

A
  • it is the weakest, but there are many
  • it is the only attachement that is not fibrous
  • instead, uses laminin and fibronectin as adhesion properties to create a macular glue like adhesion
17
Q

What causes a boat shaped hemorrhage?

A
  • pre-retinal hemorrhage
  • vitreal traction on the retina
  • blood in front of the retina and behind the vitreous body
18
Q

Vitreal hemorrhage?

A
  • diabetic retinopathy
  • neovasularization of retinal blood vessels
  • originally grown on the surface of the retina and reside between the retina and the vitreous body
  • if untreated, they can grow into the vitreous and become a high risk for bleed
19
Q

What is the outermost zone of the vitreous?

A

-vitreous cortex (hyaloid surface)

20
Q

What makes up the vitreous cortex?

A

-tightly packed type II collagen

21
Q

Describe location of anterior and posterior cortex

A
  • anterior: lies anterior to the base and lies adjacent to ciliary body, lens, and posterior chamber
  • Posterior: lies posterior to the base and is in contact with the retina
22
Q

What are the three channels of the vitreal cortex?

A
  1. Prepapillary hole
  2. Permaculture hole
  3. prevascular hole
23
Q

Tell me about the fibers in the intermediate zone

A
  • less fibers/collagen than cortex
  • peripheral fibers parallel the cortex
  • central fibers parallel the cloquet’s canal
  • vitreous tracts are membrane like condensations that differentiate areas of differing fiber density
24
Q

Cloquet’s canal. Go.

A
  • s shaped rotated 90 degrees with center dip downward
  • former site of the hyaloid artery system
  • 4-5mm in diameter
  • terminates at area of martegiani
25
Q

Where is canal of petit? Canal of hannover?

A

Petit: between anterior hyaloid membrane and post equatorial zonules (in posterior chamber)
Hannover: space between pre and post equatorial zonules. Lies in front of anterior hyaloid membrane and petit

26
Q

What does blood in Berger’s space indicate?

A

-blood leaking into the vitreous by unknown location by retinal tear or detachment

Ocular 7 (6 decks)

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