Electrical Enclosure Comparisons of NEMA and UL Type Rating Standards. When it comes to electrical safety in the USA there are two main organizations who set safety standards: NEMA (the National Electrical Manufacturers Association) and UL (Underwriters Laboratories). NEMA is the association of electrical equipment and medical imaging manufacturers in the United States.
View of the Liver and Gallbladder. Bile empties from the gallbladder into the common bile duct. The common bile duct joins with the pancreatic duct to form the ampulla of Vater, which empties into the duodenum. Before joining the pancreatic duct, the common bile duct tapers to a diameter of â¤ 0.6 cm. The sphincter of Oddi, which surrounds both the pancreatic duct and the common bile duct, includes a sphincter for each duct. Bile does not normally flow retrograde into the pancreatic duct.
Just outside of the liver (extrahepatic or perihilar) located at the notch of the liver where the bile ducts exit; Far outside of the liver (distal extrahepatic) near where the bile ducts enter the intestine (called the ampulla of Vater) Bile duct cancers are most commonly found just outside of the liver in the perihilar area and least commonly found within the liver. 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.