Aqueous Humor Compartments Flashcards
what is aqueous humor
a metabolically rich fluid, contains 1/100th of the protein of blood plasma
what structures get their nutrients from the aqueous humor
avascular lens, cornea, and trabecular meshwork
why does it have such a low protein content
to prevent light scatter and glare
where is aqueous humor secreted from
the tips of the ciliary processes
what is a relative pupillary block
when the anterior capsule of the lens and the iris block the flow of aqueous humor
what is a posterior synechiae
when the posterior surface of the iris adheres to the lens capsule
how does the aqueous humor flow in the anterior chamber
it rises posteriorly due to the warm iris vasculature, then falls anteriorly behind the cooler cornea
where does the aqueous ext the anterior chamber
through the irdocorneal angle
what is the rate at which aqueous humor is secreted
2.5-3.0 microliters per min
how often is the entire aqueous compartment turned over
every 100 minutes
what is the volume of the posterior chamber, depending on the size of the pupil
about 50 microliters
what is the volume of the anterior chamber
200-250 microliters
what 5 structures make up the irdocorneal angle (from top to bottom)
Schwalbe’s line, trabecular meshwork, scleral spur, ciliary body band, and iris root
what attaches to the posterior portion of the scleral spur
the longitudinal ciliary muscle fibers
what happens to the trabecular meshwork when the longitudinal muscle contracts, pulling the scleral spur posteriorly
it increases the size of the openings and increasing outflow (during accommodation)
