Eye
Uvea
Choroid - general


Topic Completed: 1 February 2014

Revised: 8 April 2019

Copyright: 2004-2019, PathologyOutlines.com, Inc.

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

Nat Pernick, M.D.
Page views in 2018: 333
Page views in 2019 to date: 406
Cite this page: Pernick N. Uvea: choroid - general. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/eyeuveachoroidgeneral.html. Accessed October 17th, 2019.
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:
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Choroid and iris

Microscopic (histologic) images

AFIP images
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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

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