Choroid Flashcards
Regions of Uvea
Choroid
Ciliary Body
Iris
Vascular Tunic aka….
Uvea
Location of Choroid
from ora serrata to optic n
between sclera and retina
Layers of Choroid
Suprachoroid Lamina
Choroidal Stroma
Choriocapillaris
Bruch’s Membrane
Suprachoroid Lamina
CT
b/t sclera and choroidal vessels
has parts of sclera (collagen and fibroblasts) and choroidal stroma (melanocytes)
has long post ciliary aa and nn
Choroidal Stroma
has melanocytes, fibroblasts, macrophages, lymphocytes, and mast cells
has branches of short post ciliary aa
Haller’s Layer
outer layer of choroidal stroma
has vessels w/ larger lamina that branch to form medium sized vessels
Sattler’s Layer
Middle layer of choroidal stroma
has medium sized vessels
Capillary Bed
Inner layer of choroidal stroma
Venous Drainage of Choroidal Stroma
large vortex veins
no valves
Inn of Choroidal Stroma
Symp- vasoconstriction from carotid plexus via ciliary ganglion Para- vasodilation from inf CN3 via ciliary ganglion both follow short ciliary nn
Choriocapillaris
forms layer of anastomosing, fenestrated capillaries that face retina
densest in macular area
Pericytes/ Rouget Cells
contractile functions- alter blood flow
found around capillary walls
Bruch’s Membrane Layers
BM of choriocapillaris Outer Collagenous Zone Elastic Layer Inner Collagenous Zone BM of RPE Cells
Choroid Functions
provide nutrients to outer retina
absorb excess light
pathway for post vessels and nn that supply ant seg
