Vitreous body and relationships B7 Flashcards
(27 cards)
VItreous body borders
anteriorly
peripherally
posteriorly
Anteriorly: posterior surface of crystalline lens and retro-zonular portion of the posterior chamber
Peripherally: pars plana, ora serrata and peripheral retina
Posteriorly: posterior retina and optic disc
The center of the anterior surface contains the ______________, an indentation in which the lens sits.
patellar fossa
The vitreous makes up about ____% of the entire volume of the eye.
80
All surfaces that interface with the vitreous are __________ membranes.
basement
The vitreous forms several attachments to surrounding structures. What is the strongest?
Strongest of these is the vitreous base, located at the ora serrata.
Which side of lens has most curvature?
posterior side
What are the other attachments of the vitreous: (in order of decreasing strength)
Vitreous base Posterior lens Optic disc Macula Retinal vessels
Retina is the
inner limiting membrane (important)
The vitreal fibers that form the base are embedded firmly in the basement membrane of the ___________________ of the ciliary body and the internal limiting membrane of the peripheral retina.
nonpigmented epithelium
The vitreous base extends 1.5 mm to 2 mm anterior to __________, 1 to 3 mm posterior to it and several mm into the vitreous.
ora serrata
The ______________ forms an annular attachment 1 to 2 mm wide and 8 to 9 mm in diameter between posterior surface of lens and anterior face of the vitreous.
Hyaloideocapsular ligament (Wieger’s ligament)
Within wieger’s ligament is a potential space, called ____________, which is present because lens and vitreous are juxtaposed but not joined
Berger’s space
When the annular attachment around the optic disc detaches, it can be seen and is known as ____________.
Weiss’ ring
The annular ring of attachment at the _________ is 3 to 4 mm in diameter.
macula
When the vitreal adhesions at the macula pull due to aging changes and the vitreous will not release, this tension causes wrinkling of the retinal ILM. Seen on ophthalmoscopy as cellophane.
Macular Pucker, can lead to macular damage called a macular hole.
(similar to pulling a tick of yer dog)
Where is a pre-retinal hemorrhage (boat shaped hemorrhage) located?
between vitreous and retina
In a diabetic retinopathy, _________________of retinal blood vessels can grow into the _______.
neovascularization
vitreous
(this is bad because they are very fragile vessels and they are within the vitreous, which acts as a
Vitreous zones
Outermost: vitreous cortex
intermediate zone (closer to center the collagen is less dense)
Cloquet’s canal
Remnant of hyaloid artery is called what?
Mittendorf’s dot
Vitreous cortex is also called what?
hyaloid surface
mostly composed of tightly packed type II collagen
Posterior cortex extends posterior to the base and is in contact with the retina
The vitreal cortex contains transvitreal channels that appear as holes:
Prepapillary hole
Premacular hole
prevascular fissures
A funnel shaped space at the optic nerve head that extends forward into the vitreous to become continuous with the canal
Area of Martegiani
SPace that lies within the annular ring formed by WIeger’s ligament
Berger’s space
Space formed by termination of Cloquet’s canal at the location of the vitreous-optic disc attachment.
Area of Martegiani
