Eye
Uvea (iris, choroid and ciliary body), limbus and sclera
Choroid
Author: Nat Pernick, M.D.
Last author update: 1 February 2014
Last staff update: 18 May 2022
Copyright: 2004-2023, PathologyOutlines.com, Inc.
PubMed Search: choroid eye review
Cite this page: Pernick N. Choroid. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/eyeuveachoroidgeneral.html. Accessed September 29th, 2023.
Definition / general
- Middle layer of globe between outer sclera and inner retina
- Highly vascular but no lymphatics
- Extends from ciliary body to optic nerve
- Inner aspect is adherent to retinal pigment epithelium; outer surface is loosely attached to overlying sclera
- Stroma contains abundant pigmented melanocytes
- Bruch membrane: separates choroid from overlying retinal pigment epithelium, is 2 - 4 microns thick, has 5 distinct layers (basal lamina of overlying retinal pigment epithelium, collagenous layer, elastic fiber rich layer, collagenous layer and basal lamina of endothelial cells of choriocapillaris), thickens with age, has focal excrescences known as drusen
- Choriocapillaris: in innermost choroidal stroma adjacent to Bruch membrane, connects with arterial and venous channels from vessels in outer choroidal stroma to nourish outer retinal layers
Drawings
Images hosted on other servers:
Choroid and iris
Microscopic (histologic) images
AFIP images
Vascularized pigmented stroma
Uveal tissue extends into sclera
