1 The term mesentery is often used to refer to a double layer of visceral peritoneum. 2  There are often blood vessels, nerves, and other structures between these layers. 3  The space between these two layers is technically outside of the peritoneal sac, and thus not in the peritoneal cavity. The potential space between these two layers is the peritoneal cavity; it is filled with a small amount (about 50 mL) of slippery serous fluid that allows the two layers to slide freely over each other. 2  The term mesentery is often used to refer to a double layer of visceral peritoneum.
Overview. A biliary obstruction is a blockage of the bile ducts. The bile ducts carry bile from the liver and gallbladder through the pancreas to the small intestine (the duodenum). Bile is a dark-green or yellowish-brown fluid secreted by the liver to digest fats. Much of the bile is released directly into the small intestine, but what remains is stored in the gallbladder.
The incidence of bile duct cancer increases with age. It is a slow-growing cancer that invades local structures and for that reason, the diagnosis is often made late in the disease process when the bile ducts become blocked. This blockade prevents bile drainage from the liver into the gallbladder and intestine.he incidence of bile duct cancer increases with age. It is a slow-growing cancer that invades local structures and for that reason, the diagnosis is often made late in the disease process when the bile ducts become blocked. This blockade prevents bile drainage from the liver into the gallbladder and intestine.