superior rectal vein

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su·pe·ri·or rec·tal vein

it drains the greater part of the rectal venous plexus, and ascends between the layers of the mesorectum to the brim of the pelvis, where it becomes the inferior mesenteric vein. As a tributary of the portal vein, it forms a portocaval anastomosis with the middle and inferior rectal veins (caval tributaries) via the rectal venous plexus.
Synonym(s): vena rectalis superior [TA]
References in periodicals archive ?
Causes of haemorrhoids are hereditary, morphological where the pressure by the blood column is transmitted as superior rectal vein has no valves; other causes are straining, diarrhea, constipation, hard stool, low fiber diet, over purgation, carcinoma rectum, pregnancy and portal hypertension.

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