Week 8 Flashcards
what is the limbus
transition zone between cornea and sclera
grey semi-transparent area
what are the two junctions of the limbus
cornea-conjunctival junction
cornea-scleral junction
what is the canal of schlemm
annular vessel located in a fold of sclera called scleral spur
what is the schwalbe line
the join between trabecular meshwork and corneal endothelium
what is the trabecular meshwork
reticulated tissue between canal of schlem and anterior chamber
provides resistance to outflow of aqueous to maintain pressure
what is gonioscopy
use of mirrored contact lens, to examine the anterior chamber angle
what are the 3 layers of trabeculae of collogen and stomata
uveal meshwork
scleral meshwork
endothelial meshwork
what is the uveal meshwork
fine and stringy trabeculae
large irregular stomata between trabeculae
scleral meshwork
superimposed flat sheets of trabeculae
band perforated by oval pores
stomata do not lie one over the other byt alternate position in each layer
endothelial meshwork
endothelial cells making up the wall of the canal of schlemm
what is the canal of schlemm
annular vessel at the scleral spur
no blood
what does the iris do
control the amount of light entering the eye
depth of focus
what are the 3 parts of the uvea
iris
ciliary body
choroid
where is the iris the thickest
colloarette
what is anisocria
difference in pupil size between the eyes
4 principal layers of the iris
surface
stroma
muscle layer
epithelium
what structures are within the anterior surface of the eye
fibroblasts and melanocytes
crypts of fuchs
collarette
pupillary ruff
what are the structures in the stroma of the iris
blood vessels in spiral shape
what is the muscle layer of the iris
for constrictions
ring of smooth muscle
pupillary region
ANS
what are the muscle layer of the iris
for the dilation
radial muscle
ciliary region
ANS
what are the two layers of the epithelium
contractile processes of dilator pupillae
prosterior layer of pigmented cells
what is the blood supply to the iris
vessels are within the iris stroma
Major arterial circle: supplied by long posterior, short posterior, and anterior ciliary arteries
Minor iridic circle in the pupillary region
Venous drainage: anterior ciliary veins and vortex veins
what is the nerve supply to the iris
sensory innervation
