Eye chambers Flashcards
What is the location of the anterior chamber
Space behind corneal endotheliuma in front of iris
Filled with 0.25ml of aqeous humour
What is the location of the posterior chamber
A narrow space behind iris and in front of the zonular fibres and ciliary processes
Filled with 0.06ml of aqueous humour
What is the location of the vitreous chamber
A large space behind the lens and in front of the optic nerve filled with vitreous humour
What is the function of the angle between the posterior cornea and the anterior iris surface
For the outflow of aqueous humour (draiange of aqueous humour)
Name the strucutres related to the angle
Trabecular meshwork
Schlemm’s canal
Scleral spur
Where is the trabecular meshwork located
angle of the anterior chamber near the limbus
What is the trabecular meshwork divided into
Uveal meshwork
Corneoscleral meshwork (has perforated sheets)
What is beside the uveal meshwork and what does it consist of
- beside the aqueous humour and extends from the iris root owards the corneal endothelium
- consists of rope-like brands of connective tissue, lined by endothelium
Where is the juxtacanlicular connective tissue located
between corneoscleral meshwork and schlmm’s canal
What is the juxtacanlicular connective tissue line by
endothelial cell
What is the juxtacanlicular connective tissue line by
endothelial cell
What is the 360 degree endothelial lined oval canal in the angle of the anterior chamber
Schlemm’s canal
What is the function of the giant vacuoles in the schlemm’s canal
to pass aqueous into the Schlemm’s canal
What is the Schlemm’s canal linked to
approx. 25 collector channels and veins for outflow of aqueous humour
Where does the Sclera spur lie
Posterior part of the Schlemm’s canal
What is the function of the Sclera spur
Forms an attachment for the ciliary muscles
Description of the aqueous humour
a transparent colourless fluid that flows from the posterior to anterior chamber that consists mainly of water
What is the function of the aqueous humour
Provides nutrients and oxygen to avascular corneal endothelium and lens
Removes waste products from cornea and lens
Provides optical transparency
Maintains intraocular pressure (allows eyeball to maintain shape and neurosensory retina to mainta contact with retinal pigment epithelium)
How is normal IOP maintained
Through a dynamic balance between the rate of aqueous production into the posterior chamber and aqueous drainage from the anterior chamber
Where is the aqueous dervied from
From the blood plasma within the capillaries of the ciliary processes (non pigmented epithelium cells)
What are the three mechanisms of aqueous formation
Diffusion
Ultrafiltration
Active transport
How does diffusion of aqueous formation take place
The movement of substance across a membrane along concentration gradient
As aqueous passes from pc to adm the fluid comes into contact with carious tructures and difussional exchange takes places across the membrane of these structures so taht AC aqueous will resemble plasma
How does Ultrafiltration formation take place
The process of removing fluid from the blood stream across semipermeable membrane under a pressure gradient
Blood plasma filtres through the capillary wall to the PC due to pressure difference
How does active transport take place
An energy dependent process that selectrivey moves across a cell membrane
It is done by the Na+/K+ ATPase, an energy dependent active pump system present at the interdigitation ofthe non pigmented epithelial cells of the ciliary body
