Bile duct

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A bile duct is one of a number of long tube-like structures that carry bile, and is present in most vertebrates.

Bile, necessary for the digestion of food, is secreted by the liver into a channel carrying bile to the liver duct, which joins the cystic ducts (to bring bile to and from the gallbladder) to form the bile duct, which opens into the intestine.

The biliary tree (see below) is an entire network of various branched-sized channels through the liver.

The path is as follows: Biliary Canaluli -> Hemoglobin -> interlobular biliary duct -> intrahepic bile duct -> left and right ducts join to form -> common heart channels out of the heart and join -> cystic duct (from the gall bag) form -> bile duct with -> joined with pancreatic channel - > formed the ampere Vater -> entered duodenum

Video Bile duct

Structure

The bile duct is green like a gallbladder, because of bile stain.

Supply of nerves

Balloon inflation in the bile ducts causes, through the vagus nerve, activation of the brain stem and the insular cortex, the prefrontal cortex, and the somatosensory cortex.

Maps Bile duct

Clinical interests

Blockage

Blockage of bile ducts by gallstones, scars from injury, or cancer prevent bile transported to the intestine and the active ingredient in bile (bilirubin) instead accumulates in the blood. This condition produces jaundice, where the skin and eyes become yellow from bilirubin in the blood. This condition also causes severe itching of bilirubin stored in the tissues. In certain types of jaundice, urine will appear darker, and the stool will be more pale than usual. This is caused by bilirubin all flowing into the bloodstream and filtered into the urine by the kidneys, rather than partially lost in the stools through the Vater ampulla.

Jaundice

Jaundice is generally caused by conditions such as pancreatic cancer, which causes blockage of the bile duct passes through the pancreatic cancer section; cholangiocarcinoma, bile duct cancer; blockage by stones in patients with gallstones; and from scar tissue after injury to the bile ducts during removal of the gallbladder.

Drainage

Biliary drainage is done by a tube or catheter (called bile duct, biliary stent or biliary catheter) by a surgeon or, usually, an interventional radiologist. This can be used to relieve blockages in the bile duct, either permanently or as a temporary solution before a definite treatment such as surgery. The drainage can be placed percutaneously through the liver, with a procedure subsequently called percutaneous transcutaneous border drainage (PTBD). This can also be done as part of percutaneous transhepatic cholangiography, then a form of interventional radiology. The bile ducts can also be used to collect bile samples for diagnostic or disease monitoring, as well as providing administrative routes for medical materials.

In infants with biliary atresia, hepatoportoenterostomy is an alternative method of providing bile drainage.

Cholangiocarcinoma

Cholangiocarcinoma or bile duct cancer is a form of cancer composed of mutated epithelial cells (or cells that exhibit characteristics of epithelial differentiation) originating from the bile ducts. Cholangiocarcinoma is regarded as a cancer that can not be cured and fatal quickly unless the primary tumor and all metastases can be removed completely by surgery. There is no potentially curative treatment except surgery, but most people have advanced disease at presentation and are inoperable at the time of diagnosis.

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Additional images

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References

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External links

• Cholangiocarcinoma Foundation
• The Johns Hopkins Gall Bladder & amp; Bile Cancer Web Page
• Gall Channel in US National Library of Medicine's Medical Subject Headings (MeSH)

Source of the article : Wikipedia