choroid

cho·roid

C0328300 (kôr′oid′) or cho·ri·oid (kôr′ē-oid′)n. The dark-brown vascular coat of the eye between the sclera and the retina. Also called choroid coat, choroid membrane.adj.1. Resembling the chorion; membranous.2. Of or relating to the choroid.

[From Greek khoroeidēs, like an afterbirth, alteration of khorioeidēs : khorion, afterbirth; see chorion + -oeidēs, -oid.]

choroid

(ˈkɔːrɔɪd) or

chorioid

adj (Anatomy) resembling the chorion, esp in being vascularn (Anatomy) the brownish vascular membrane of the eyeball between the sclera and the retina[C18: from Greek khoroeidēs, erroneously for khorioeidēs, from chorion]

cho•roid

(ˈkɔr ɔɪd, ˈkoʊr-)
adj. 1. Also, cho•roi′dal. like the chorion; membranous. n. 2. choroid coat. [1625–35; < Greek choroeidḗs false reading for chorioeidḗs; see chorion, -oid]

choroid

The eyeball’s dark middle layer.

Thesaurus

Noun

choroid - a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eyechoroid coateye, oculus, optic - the organ of sighttissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Translations

Choroid

choroid

[′kȯr‚ȯid] (anatomy) The highly vascular layer of the vertebrate eye, lying between the sclera and the retina.

Choroid

the connective-tissue coat of the eye located between the retina and the sciera. It is through the choroid that metabolites and oxygen pass from the blood to the pigmentary epithelium and photoreceptors of the retina.

The choroid includes a suprachoroid layer facing the sciera, a layer of large veins, a layer of arteries and veins, the choriocapil-laris, and Bruch’s membrane. The suprachoroid layer consists of compact reticulin and collagenous fibers. It is rich in fibroblasts and melanocytes, whose processes run through the entire choroid. The arteries and veins of the choroid have a double endothelial lining and basal and adventitial layers. Bruch’s membrane is made up of an amorphous substance containing elastic reticulin and collagenous fibers. It is bounded on the inside by a cell membrane of pigmentary epithelium and on the outside by a porous membrane of capillary endothelium.

The choroid of some fishes and mammals, for example, ungulates, has a reflecting layer, or a mirror, that intensifies the light stimulation of the photoreceptors and increases the sensitivity of the eye to light.

REFERENCES

Stebaeva, L. F., and O. V. Volkova. “Ul’trastruktura sosudistoi obo-lochki glaza krolika v norme i pri allergicheskom uveite.” Arkhiv anatomii, gistologii i embriologii, 1974, vol. 66, no. 2.
System of Ophthalmology, vol. 2. Edited by S. Duke-Elder. London, 1961.
Structure of the Eye: Proceedings of the Symposium at the Seventh International Congress of Anatomists. New York-London, 1961.

O. G. STROEVA

choroid

[kor´oid] the middle, vascular coat of the eye, between the sclera and the retina. adj., adj choroid´al. It contains an abundant supply of blood vessels and a large amount of brown pigment that serves to reduce reflection or diffusion of light when it falls on the retina. Adequate nutrition of the eye is dependent upon blood vessels in the choroid.

cho·roid

(kor'oyd), [TA] Portion of the middle or vascular layer of the eyeball lying between the pigment epithelium and the sclera and posterior to the other parts of the vascular layer, the ciliary body, and iris. Synonym(s): choroidea [TA] [G. choroeidēs, a false reading for chorioeidēs, like a membrane]

choroid

(kôr′oid′) or

chorioid

(kôr′ē-oid′)n. The dark-brown vascular coat of the eye between the sclera and the retina. Also called choroid coat, choroid membrane.adj.1. Resembling the chorion; membranous.2. Of or relating to the choroid.

choroid

noun The highly vascularised and pigmented nutrient middle layer of the eye, located between retina and sclera (the tapetum is an iridescent layer in the choroid of some eyes); part of the uvea.

cho·roid

(kōr'oyd) [TA] The middle vascular tunic of the eye lying between the retina and the sclera.
Synonym(s): choroidea [TA] . [G. choroeidēs, a false reading for chorioeidēs, like a fetal membrane]

choroid

The densely pigmented layer of blood vessels lying just under the retina of the eye, contributing to its fuel and oxygen supply and optical efficiency.

choroid

a layer behind the retina of the vertebrate eye which contains blood vessels and pigment.
resembling the CHORION.

Choroid

The part of the uveal tract behind the ciliary body. The choroid underlies and nourishes the retina and absorbs scattered light.Mentioned in: Uveitis

choroid

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chorioid

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choroid

Choroid

choroid

Choroid

REFERENCES

choroid

choroid

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choroid

choroid

Choroid

choroid

Synonyms for choroid

noun a highly vascular membrane in the eye between the retina and the sclera

Synonyms

Related Words