Three regions of the uvea from front to back

thin circular structure located anterior to the lens

Referred to as the diaphragm of the optical system

The pupil is actually located slightly nasal an inferior to iris center

A.K.A VASCULAR LAYER

Normal pupil size

Average diameter of iris

Thickest region of iris

Thinnest part of iris

The sphincter muscle is near the anterior layer than the dilator muscle

Pigmented cells of iris include

Thick-walled blood vessels

Remnant of embryonic development

Sphincter is a CIRCULAR muscle 0.75 to 1mm wide

posterior epithelium of iris is heavily pigmented

Dark brown wrinkled rim of normal pupil

Opening in the surface of iris

When viewed from front of eye, ciliary body is a ring shaped structure

Ciliary body. With is approximately 5.9mm on nasal and 6.7mm on temporal side

Apex of ciliary body is located at the

Pars plicata other name

Other name for pars plana

Insertion of ciliary muscle in anterior 1/3 of choroid in form of Stella the shaped termination or

Highly vascularized loose connective tissue

the choroid extends from the ora serrata to the optic nerve and is located between the sclera and the retina

Thin pigmented ribbonlike branching bands of connective tissue in choroid

Other name for suprachoroid lamina is lamina fusca

Layer of choroid contains components from both sclera and choroidal stroma

The looseness of the tissue of the lamina fusca allows the VASCULAR net to swell without causing detachment

pigmented vascularized loose connective tissue containing melanocytes fibroblasts macrophages lympocytes and mast cells

other name for pericytes

Innermost layer of the choroid which fuses with the retina

runs from optic nerve to the ora serrata where it undergoes some modification before continuing into ciliary body

Both ciliary body capillaries and the epithelial layers are active in production and secretion of aqueous

Selectively controls the substance that is secreted as the aqueous humor

Deposits can be seen as small yellow spots in fundus

there is significant correlation between loss of ciliary muscle contractile ability and age

The changes that occur in AMD occur throughout the choroid with advancing age

Brunch’s membrane increases in thickness with age

Lipid particles decreases membranes permeability to serum protein thus metabolite in retina decreases

Calcification and deposits in inner collagenous layer are responsible for appearance of drusen which increases in number with age