Eye

Uvea (iris, choroid and ciliary body), limbus and sclera

Choroid



Last author update: 1 February 2014
Last staff update: 18 May 2022

Copyright: 2004-2024, PathologyOutlines.com, Inc.

PubMed Search: choroid eye review

Nat Pernick, M.D.
Page views in 2023: 495
Page views in 2024 to date: 139
Cite this page: Pernick N. Choroid. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/eyeuveachoroidgeneral.html. Accessed March 29th, 2024.
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:
Missing Image

Choroid and iris

Microscopic (histologic) images

AFIP images
Missing Image

Vascularized pigmented stroma

Missing Image

Uveal tissue extends into sclera

Back to top
Image 01 Image 02