vitreous chamber

1. Anatomy of
vitreous
APARNA THOOMBAN
HARIDAS

2. GENERAL FEATURES
• Vitreous humour is an inert,transparent,colourless,jelly
like structure.
• Hydrophilic gel serves as optical functions and act as
important supporting structure for eyeball.
• Anteriorly-by lens and ciliary body
• Posteriorly-by retina
• Weight-4g,Volume-4cc(2/3 of entire globe)
• Approximately 99%water

3. STRUCTURE
• The vitreous is the largest and simplest
connective tissue present as a single piece
in the human body
• Divided into 3 parts
1.Hyaloid layer or membrane
2.Cortical vitreous
3.Medullary vitreous

4. HYALOID LAYER
It is not a true membrane but the outermost
surface of vitreous
1.Anterior hyaloid membrane(anterior limiting
membrane layer)
2.Posterior membrane(posterior limiting
membrane layer)

5. Anterior hyaloid membrane
It covers vitreous body ant 1.5mm from the ora serata
Lies in contact with pars plana,ciliary processes,ciliary
zonules and posterior lens capsule(form ring about 9mm in
diameter called as hyaloido-capsular ligament of wieger in
center of it space called Berger’s space
It connect with other intraocular structures by following fine
ligaments
Hyalociliary zonules-extend from ant hyaloid membrane to
valley between ciliary processes
Retrolental ligament-ant hyaloid membrane to lens

6. Coronary ligament-its fibres extend ant hyaloid membrane to inner face
of the post third of ciliary processes circumferentially.
Median ligament-it also runs circumferentially from ant hyaloid
membrane at the level of mid zone of pars plana

7. Posterior hyaloid membrane
It extend back from the vitreous base up to the optic disc.
It lie in contact with the internal limiting membrane of the retina

8. CORTICAL VITREOUS
❑ It is more condensed fibrillar vitreous.
❑ It contain type 2 collagen fibrils
interspersed with the sodium hyaluronate,
mucopolysaccharide molecules which
provide viscocity,elasticity and tensile
strength to it.

9. ❑ 2 percent of the total vitreous volume.
❑ It is the metabolic centre of the vitreous body(vitreous cells-
hyalocytes)
❑ Vitreous cells synthesize the hyaluronic acid

10. MEDULLARY VITREOUS
❖ Majority of vitreous body is form by central medullary vitreous
❖ Similar to cortical vitreous except it is less fibrillar structure and
cell free

11. VITREOUS TRACTS
Vitreous tracts are fine sheet like condensations of vitreous tissue which radiate
into the vitreous space from ciliary body and ant retina
✔ Tractus retrolentis:innermost tract
Attached anterior to posterior lens capsule and posterior infront of optic disc
Forms reflecting membrana plicata of vogt.
✔ Tractus coronarium:
Attached anterior to coronary ligament and posterior lateral to tractus
retrolentis
✔ Tractus medianus:
Attached anterior to ligamentum medianum and posterior lateral to tractus
coronarium
✔ Tractus preretinalis:
Attached anterior at ora serrata circum and posterior lateral to tractus
medianus

13. TOPOGRAPHIC SUBDIVISIONS OF
VITREOUS SPACE
ZONES OF VITREOUS SPACE
RETRORENTAL ZONE
Anterior boundary-patellar fossa
INTERMEDIATE ZONE
Anterior boundary-epiciliary portion of anterior hyaloid membrane.
Medially-tractus retrolentis
Laterally-tractus preretinalis
Coronary and median tract are present in the zone.
PRERETINAL ZONE
Medially-tractus preretinalis
Laterally-retina

14. ATTACHMENTS OF THE
VITREOUS
• OPTIC DISC
• BACK OF LENS
• FOVEAL REGION
• ORA SERRATA

15. VITREOUS BASE
o Atoraserrata.
o Anteriorextensions:toadjoiningparsplanapartofciliarybodyanteriorto
oraserrata.
o Posteriorextension:toperipheralretinaposteriortooraserrata.
o Strongestattachmentofvitreous.
o Collagenfibresofcorticalvitreousareinsertedatrightanglesatbase.

16. THANK YOU