Choroid - general

Author: Nat Pernick, M.D. (see Authors page)

Revised: 23 May 2018, last major update February 2014

Copyright: (c) 2004-2018, PathologyOutlines.com, Inc.

PubMed Search: choroid [title] eye review[ptyp]

Cite this page: Pernick, N. Uvea: choroid - general. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/eyeuveachoroidgeneral.html. Accessed December 9th, 2018.
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

Images hosted on other servers:
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Choroid and iris

Microscopic (histologic) images

Images hosted on PathOut server:
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Vascularized pigmented
stroma between Bruch
membrane (middle)
and sclera (below)

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Uveal tissue extends
into sclera within
sclera canals around
a long ciliary vessel