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The ampulla of Vater, hepatopancreatic ampulla or hepatopancreatic duct is the common duct that is usually formed by a union of the common bile duct and the pancreatic duct within the wall of the duodenum. This common duct usually features a dilation ("ampulla"). The common duct then opens medially into the descending part of the duodenum at the major duodenal papilla. The common duct usually measures 2-10mm in length. The ampulla of Vater is an important landmark halfway along the second part of the duodenum marking the transition from foregut to midgut. Various smooth muscle sphincters regulate the flow of bile and pancreatic juice through the ampulla: the sphincter of the pancreatic duct, the sphincter of the bile duct, and the sphincter of Oddi. The common bile duct and pancreatic duct may sometimes unite outside the duodenal wall, creating an unusually long common duct. The two ducts may also drain into the duodenum separately, or may fuse yet retain their separate lumens separated by a septum. Thomas' sign is the production of silver stools and can be indicative of cancer of the Ampulla of Vater. The silver-colored stool is a combination of the white stool of obstructive jaundice combined with black stool of melena or bleeding. It was first described in the British Medical Journal by Dr. H. Ogilvie in 1955. The eponymic term "ampulla of Vater" is named after Abraham Vater (1684–1751), a German anatomist who first published a description of it in 1720. File:Gray1100.png|The pancreatic duct. File:Ultrasound Scan ND 090551 0930550 cr.

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