Lassaline - Anterior Segment

what is the anterior segment?

the lens forward

name the components of the uvea

fibrous, vascular and neurosensory tunic

fibrous tunic

sclera and cornea

vascular/middle tunic

choroid

ciliary body

iris

retina tunic

neural and pigmented layer

iris - contains

connective tissue, muscle and nerves

iris - structures

corpora nigra

collarette

major iridal circle

name the iris muscles

sphincter and dilator

iris muscles - sphincter

constriction

circular

parasympathetic - 3

iris muscles - dilator

dilates

sympathetic - 5

radial

function of the ciliary body

produce the aqueous humor

uvea immunity

immune-privileged - behaves as an accessory lymph node

parts of the lens

has a capsule, anterior epithelium and lens fibers

divided into cortex and nucleus

lens metabolism - vasculature

avascular, met by the aqueous humor

lens metabolism - glucose

broken down anaerobically to lactic acid by hexokinase pathways

lens metabolism - excess glucose

sorbitol pathway converted by aldose reductase to sorbitol