Bile duct

When bile duct bile transport routes are designated. There are intrahepatic ( located in the liver, from the Greek hepar "liver" ) ( located outside the liver) bile ducts and extrahepatic.

Intrahepatic bile ducts

The bile ducts begin with the canaliculi. The bile also common name is misleading, as compared to blood capillaries, the canaliculi are not lined by endothelium. The canaliculi are gap spaces between the liver cells without own wall. They have a diameter of about 1 micron and are sealed by zonules occludentes ( hepatobiliary barrier). In the wall of the bile canaliculi seated cholangiocytes produce about a third of the bile, the rest comes from the liver cells. The bile flows through the bile from the liver lobules centrifugally towards the respective Glissonschen triangle.

The bile capillaries unite to form a interlobular ( between the lobules located ) bile duct ( ductus biliferus ), together with a branch of the hepatic artery ( hepatic artery ) and the portal vein ( portal vein ) as so-called " Glisson 's triad " (also called " liver triad " Triassic hepatica ) runs in the periphery of the liver lobule. Bile ducts have a single-layered - prismatic epithelium.

Extrahepatic bile ducts

For the right and left lobes of the liver occurs from the hepatic portal from each one hepatic duct, the common hepatic duct dexter and sinister. These (often " common hepatic duct " caliber in humans to 7 mm, abbreviation in medicine with DHC ) unite to form the common hepatic duct. In some animals (eg, predators, birds) remains under this union, so that no common hepatic duct is formed.

At the height anatomically very variable, but usually in the middle third of the cystic duct opens into the common hepatic duct.

The common passage to this association of liver and bile duct is called the common bile duct. This leads to the major duodenal papilla with the pancreatic duct into the duodenum (duodenum ). The bile can thus be transported directly into the duodenum, or first for temporary storage in the gallbladder.

Pathology

Biliary atresia is a rare disease of newborns, with the increasing inflammation of the extra-and intrahepatic bile ducts leads to a complete closure of the biliary tract. The hemobilia is a bleeding into the bile ducts due to the breach of a hepatic artery.

• Digestive Disorders
• Liver