Choroid

Template:Infobox Anatomy

WikiDoc Resources for Choroid

Articles

Most recent articles on Choroid

Most cited articles on Choroid

Review articles on Choroid

Articles on Choroid in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Choroid

Images of Choroid

Photos of Choroid

Podcasts & MP3s on Choroid

Videos on Choroid

Evidence Based Medicine

Cochrane Collaboration on Choroid

Bandolier on Choroid

TRIP on Choroid

Clinical Trials

Ongoing Trials on Choroid at Clinical Trials.gov

Trial results on Choroid

Clinical Trials on Choroid at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Choroid

NICE Guidance on Choroid

NHS PRODIGY Guidance

FDA on Choroid

CDC on Choroid

Books

Books on Choroid

News

Choroid in the news

Be alerted to news on Choroid

News trends on Choroid

Commentary

Blogs on Choroid

Definitions

Definitions of Choroid

Patient Resources / Community

Patient resources on Choroid

Discussion groups on Choroid

Patient Handouts on Choroid

Directions to Hospitals Treating Choroid

Risk calculators and risk factors for Choroid

Healthcare Provider Resources

Symptoms of Choroid

Causes & Risk Factors for Choroid

Diagnostic studies for Choroid

Treatment of Choroid

Continuing Medical Education (CME)

CME Programs on Choroid

International

Choroid en Espanol

Choroid en Francais

Business

Choroid in the Marketplace

Patents on Choroid

Experimental / Informatics

List of terms related to Choroid

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

The choroid, also known as the choroidea or choroid coat, is the vascular layer of the eye lying between the retina and the sclera, with a thickness about 0.5 mm. The choroid provides oxygen and nourishment to the outer layers of the retina [2].

Along with the ciliary body and iris, the choroid forms the uveal tract. In humans and other primates, darkly colored melanin pigment in the choroid helps limit reflections within the eye that would potentially result in the perception of confusing images. Poor vision frequently results from lack of this pigmentation in human albinos. By contrast, the choroid of many other animals contains reflective materials that help to collect light in dim situations; this is one type of tapetum lucidum.

The red eye effect on photos is caused by the reflection of light from choroid. It appears red because of the choroid's blood vessels.

## Contents

* 1 Layers
* 2 See also
* 3 Additional images
* 4 External links

## Layers

[edit | edit source]

The structure of the choroid is generally divided into four layers:

* Haller's layer - outermost layer of the choroid consisting of larger diameter blood vessels
* Sattler's layer \- layer of medium diameter blood vessels
* Choriocapillaris \- layer of capillaries
* Bruch's membrane \- innermost layer of the choroid

## See also

[edit | edit source]

* Chorioretinitis
* Uveitis

## Additional images

[edit | edit source]

* Iris, front view.

* The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section.

* The interior of the posterior half of the left eyeball.

## External links

[edit | edit source]

* Histology image: 08008loa – Histology Learning System at Boston University

Template:Eye

Template:WikiDoc Sources

ca:Coroide de:Chorioidea el:Χοριοειδής χιτώνας he:שכבה דמית lt:Gyslainė nl:Vaatvlies sk:Cievovka