ANATOMY - ANGLE Flashcards
What are the borders of the anterior chamber?
ANTERIOR : posterior cornea
POSTERIOR: anterior iris
How deep is the anterior chamber?
3mm
Is the anterior chamber shallower in hypermetropes or myopes?
Shallower in hypermetropes - Axial length is smaller
How much aqueous humor is present in the anterior chamber?
0.25ml
What are the structures of the angle of the anterior chamber? (6)
- Iris Root
- Ciliary Body
- Scleral Spur
- Trabecular meshwork (posterior/pigmented)
- Trabecular meshwork (anterior/not-pigmented)
- Schwalbe’s line
I CAN SEE TILL SCHWALBE’S LINE
What is the scleral spur
At the junction of the limbus, internally there is a groove/indendation called the scleral sulcus.
A projection posterior from this area and is called the scleral spur
What is the ciliary body band?
Ciliary body is attached to scleral spur - a space exists here called the supraciliary space bewteen the ciliary body and sclera
Iris inserts into anterior side of ciliary body, and part of the ciliary body between iris and scleral spur is ciliary band, which is seen on gonioscopy
What is Schlemm’s Canal?
A Continuation of trabecular meshwork as a canal - it is oval in shape and is lined by endothelium
It is perforated by aqueous collector channels which branch into intrascleral and deep scleral plexi
What is Schwalbe’s line
Trabecular meshwork inserts into the periphery of the cornea at a ridge, known as Schwalbe’s line - marks the end of Descemet’s membrane of the cornea
Most anterior structure of gonioscopy
What is posterior embryotoxon?
Anterior displacement of Schwalbe’s line which is prominent on external exmination - associated with eisenfeld riger syndrome
What is Sampaoelsi’s line?
Pigmented Schwalbe’s line seen in PXF and pigment dispersion syndrome
What are the main age related changes seen in the trabecular meshwork? (5)
1) Increased pigmentation
2) Increased debris accumulation
3) Increased glycosaminoglycan deposition in extracellular space
4) Thickened basement membrane
5) Reduced endothelial cells
