portal system

portal system
portal system n a system of veins that begins and ends in capillaries see HEPATIC PORTAL SYSTEM, PITUITARY PORTAL SYSTEM

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a vein or group of veins that terminates at both ends in a capillary bed. The best known is the hepatic portal system, which consists of the portal vein and its tributaries. Blood is drained from the spleen, stomach, pancreas, and small and large intestines into veins that merge to form the portal vein leading to the liver. Here the portal vein branches, ending in many small capillaries called sinusoid. These permit the passage into the liver cells of nutrients absorbed by blood from the intestines.

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an arrangement of vessels whereby blood collected from one set of capillaries passes through a large vessel or vessels and then through a second set of capillaries before it returns to the systemic circulation, such as in the hepatic portal circulation and the hypothalamo-hypophysial portal system.

Medical dictionary. 2011.

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  • portal system — a vein or group of veins that terminates at both ends in a capillary bed. The best known is the hepatic portal system, which consists of the portal vein and its tributaries (see illustration). Blood is drained from the spleen, stomach, pancreas,… …   The new mediacal dictionary

  • portal system — noun system of veins that carry blood from the abdominal organs to the liver • Hypernyms: ↑vascular system • Part Meronyms: ↑portal vein, ↑hepatic portal vein, ↑portal, ↑vena portae …   Useful english dictionary

  • portal system — noun Etymology: portal vein Date: 1851 a system of veins that begins and ends in capillaries …   New Collegiate Dictionary

  • portal system — Anat. 1. a vascular arrangement in which blood from the capillaries of one organ is transported to the capillaries of another organ by a connecting vein or veins. 2. (loosely) the hepatoportal system. [1850 55] * * * …   Universalium

  • portal system — por′tal sys tem n. anat. a vascular arrangement in which blood from the capillaries of one organ is transported to the capillaries of another organ by a connecting vein or veins • Etymology: 1850–55 …   From formal English to slang

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  • Hypophyseal portal system — Infobox Vein Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Caption2 = DrainsFrom = Source = DrainsTo = Artery = MeshName = MeshNumber = DorlandsPre = s 33 DorlandsSuf = 12787512 The hypophyseal portal system (or hypothalamo… …   Wikipedia

  • pituitary portal system — n a portal system supplying blood to the anterior lobe of the pituitary gland through veins connecting the capillaries of the median eminence of the hypothalamus with those of the anterior lobe * * * hypothalamo hypophysial portal s …   Medical dictionary

  • hypothalamic hypophysial portal system — hypothalamic pituitary system, hypothalamic pituitary portal system hypothalamo hypophysial portal s …   Medical dictionary

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