portal vein


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portal

 [por´tal]
1. porta.
2. pertaining to an entrance, especially the porta hepatis.
portal vein a short, thick trunk formed by the union of the superior mesenteric, inferior mesenteric, and splenic veins behind the neck of the pancreas; it ascends to the right end of the porta hepatis, where it divides into successively smaller branches, following branches of the hepatic artery, until it forms a capillary system of sinusoids that permeates the entire substance of the liver.

he·pa·tic por·tal vein

[TA]
a wide short vein formed by the confluence of the superior mesenteric and splenic vein posterior to the neck of the pancreas, ascending anterior to the inferior vena cava, and dividing at the right end of the porta hepatis into right and left branches, which ramify within the liver.

portal vein

n.
A vein that conducts blood from the digestive organs, spleen, pancreas, and gallbladder to the liver.

portal vein

a vein from the small intestine that ramifies in the liver and ends in capillary-like sinusoids that convey the blood to the inferior vena cava through the hepatic veins. The portal vein passes behind the duodenum and ascends through the lesser omentum to the porta hepatis, where it divides into the right and left branches. The vein is surrounded by the hepatic plexus of nerves and is accompanied by numerous lymphatic vessels, some lymph nodes, and corresponding branches of the hepatic artery. The right branch of the portal vein enters the right lobe of the liver, and the left branch enters the left lobe.

por·tal vein

(pōr'tăl vān)
A wide, short vein formed by the superior mesenteric and splenic vein posterior to the neck of the pancreas, ascending in front of the inferior vena cava, and dividing at the right end of the porta hepatis into right and left branches, which ramify within the liver.
Synonym(s): vena portae hepatis [TA] , hepatic portal vein.

portal vein

The large vein that carries blood from the intestines, the STOMACH, the lower end of the OESOPHAGUS and the SPLEEN into the liver. After a meal the portal vein contains large quantities of digested nutrients.

portal vein

any vein that carries blood from one set of capillaries to another, such as renal-portal and hepatic-portal veins.

Portal vein

Formed by a fusion of small veins that end in a network of capillaries, the portal vein delivers blood to the liver.

portal

1. an avenue of entrance; porta.
2. pertaining to an entrance, especially the porta hepatis.

portal-azygos anastomosis
a form of portacaval shunt with the portal vein bypassing the liver and emptying directly into the azygos vein.
portal biliary bacterial circulation
a continuous normal circulation of bacteria brought to the liver in the portal vein from the gut and excreted back into the gut via the biliary system.
portal canal
tissue space situated between three or more hepatic lobules; carries the blood and lymphatic vessels and connective tissue.
portal-caval
see portacaval.
portal circulation
circulation of blood from the capillaries of one organ to those of another; applied especially to the passage of blood from the gastrointestinal tract and spleen through the portal vein to the liver. See also circulatory system.
portal of entry
the pathway by which bacteria or other pathogenic agents gain entry to the body.
portal fibrosis
see biliary fibrosis.
portal hypertension
see portal obstruction.
portal obstruction
obstruction of portal venous blood flow through external pressure on the portal vein, by abscess or tumor or by hepatic fibrosis constricting the hepatic vascular bed, causes interference with digestion and absorption and eventually venous return so that ascites and diarrhea develop.
portal system
an arrangement by which blood collected from one set of capillaries passes through a large vessel or vessels and another set of capillaries before returning to the systemic circulation, as in the pituitary gland and liver.
Includes the hepatic portal system consisting of portal vein and its tributaries from the stomach, intestine, pancreas and spleen, the vessels into which the portal vein divides in the liver and the hepatic veins that enter into the caudal vena cava.
portal systemic shunt
see portacaval shunt.
portal triad
anatomically close association of interlobular bile duct, branches of hepatic artery and portal vein.
portal vascular anomalies
see portacaval anastomosis.
portal vein
a short, thick trunk formed by the union of the caudal mesenteric and splenic veins; at the porta hepatis, it divides into successively smaller branches, following branches of the hepatic artery, until it forms a capillary system of sinusoids that permeates the entire substance of the liver.
portal vein obstruction
acute, complete obstruction causes a syndrome similar to that of intestinal obstruction without signs suggesting liver involvement; partial occlusion causes shrinkage and eventual atrophy of the relevant section of the liver.
portal vein rupture
rare complication of epiploic foraminal herniation; sudden death from internal hemorrhage results.
portal venule absence
a congenital defect resulting in the development of multiple shunts within the liver, hepatoportal fibrosis and ascites, general immaturity and hepatic encephalopathy.
References in periodicals archive ?
Portal vein was seen to supply majority of caudate lobes through a single branch, usually from the left branch in 55.
Portal vein thrombosis (PVT): A study of 20 non-cirrhotic cases.
The aim of this study was to assess the accuracy of noninvasive markers (platelet counts, portal vein diameter, splenic diameter, and ratio of platelet count to spleen diameter, PC/SD) in determining existing esophageal varices and thereby to propose them as a noninvasive, reproducible, safe, and accurate means for improving the management of cirrhotic patients.
In our patient, CVAE may have resulted from the retrograde flow of air from the mesenteric veins and portal vein followed by the passage of air through the right cardiac chambers and cerebral venous vasculature.
In our patient, there was thrombus extending to the portal vein, which led us to choose thrombolysis rather than primary venoplasty and stent re-lining.
To avoid these severe complications, covered stents have been used to maintain perfusion, which is particularly important in patients at risk of portal vein thrombosis.
Patients who refused consent or had hepatocellular carcinoma or hepatic encephalopathy, high serum bilirubin (>5 mg \100 ml), thrombus in portal vein or in hepatic vein or inferior vena cava, constrictive pericarditis or congestive cardiac failure or any other disease causing dilated inferior vena cava were excluded.
Endotoxin concentration in the portal vein and carotid of the goats kept stable from 15:00 to 20:00 (HS period) within each treatment, and decreased (p<0.
Haberal, "Protective effect of resveratrol, a red wine constituent polyphenol, on rats subjected to portal vein thrombosis," Transplantation Proceedings, vol.
These methods can also help to exclude acquired portosystemic shunts or portal vein thrombosis as a cause for the imaging findings.
Portal venography of the donor showed type B, trifurcation pattern anomaly of the portal vein into the right anterior, right posterior, and left main portal branches at its division.
The rate of portal vein complications, including portal vein stenosis (PVS), is between 4% and 8%.