portal triad

(redirected from Portal triads)

por·tal tri·ad

branches of the portal vein, hepatic artery, and the biliary ducts bound together in the perivascular fibrous capsule or portal tract as they ramify within the substance of the liver.
Synonym(s): hepatic triad, triad (3)

por·tal tri·ad

(pōr'tăl trī'ad)
Branches of the portal vein, hepatic artery, and the biliary ducts bound together in the perivascular fibrous capsule or portal tract as they ramify within the substance of the liver.
Synonym(s): triad (3) .


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.
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 ?
The basic functional unit of the liver is the hepatic lobule, which consists of portal triads (hepatic arteriole, portal venule, bile duct, lymphatics and branch of the vagal nerve) at the periphery that surround a central vein (Fig.
Injured bile ducts surrounded by a dense infiltrate of mononuclear cells, most of which are lymphocytes, these florid, asymmetric destructive lesions of interlobular bile ducts are irregularly scattered throughout the portal triads and often seen only on large surgical biopsies of the liver in which adequate representation of small bile ducts occurs; inflammation is confined to the portal trials (Hirschfield, 2011).
The lesion is more widespread but less specific; there may be reduced numbers of normal bile ducts within portal triads and increased numbers of atypical, poorly formed bile ducts with irregularly shaped lumina.
The classic findings on liver biopsy of patients with PBC is asymmetric destruction of the bile ducts within the portal triads.
Additionally, because the nodules cannot be visualized on routine H&E or trichrome staining, a special reticulin stain must be performed to show the nodules clustered around the portal triads without fibrosis or collagen deposition, in contrast to alcoholic cirrhosis.
The connective tissue divides the hepatic parenchyma in lobules and receives the name of periportal connective tissue, since it surrounds the portal triads.
This change was found chiefly at the portal triads, been also visible in some cases at the periphery of the central vein (Figs.
Percentage distribution for the level of staining of collagen in portal triads in C2-3 and E2-3.
The absence of division into hepatic lobules and the lack of portal triads are features of A.
However, no hepatic lobules or portal triads were observed.
AHF did not compress the adjacent liver and might include portal triads.
Adenomas (ADs) showed growth by expansion resulting in displacement of portal triads and compression of adjacent normal tissue.