venous (redirected from orbital venous plexus)

venous /ve·nous/ (ve´nus) pertaining to the veins.

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ve·nous (vns)

adj.

Of, relating to, or contained in the veins.

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venous

pertaining to the veins.

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venous dilatation

persistent dilatation of the vein but without necessarily any weakening of the wall or varicosity.

hepatic portal venous system

includes the veins from the alimentary tract, the portal vein, the sinusoids in the liver, the hepatic veins and then the entry into the caudal vena cava.

venous infarct

see venous infarct.

obstructed venous drainage

may be generalized or local; manifested by dilation, local edema.

orbital venous plexus

a plexus for venous drainage from the ophthalmic veins at the apex of the orbit; drains into the cavernous venous sinus within the cranium.

venous return

the flow of blood into the heart from the peripheral vessels.

venous return curves

relate venous return to atrial pressure; the inverse of the Starling relationship; an increase in atrial pressure decreases the venous return.

scleral venous plexus

a ring of small vessels around the corneal limbus which forms a link in the chain of vessels which drain the aqueous humor. Called also canal of Schlemm.

venous sinuses

see venous sinus.

venous system

the bodily system of veins commencing with the venae cavae, thence through the large veins and their tributaries, and immediately subsequent to the capillaries, the venules.

venous thrombosis

the presence of a thrombus in a vein. Originates in phlebitis in most cases. It is a major problem in horses because of the high incidence of jugular phlebitis and periphlebitis as a result of injection of irritating materials. See also caudal vena caval thrombosis.