A sheath of muscle fibers surrounding the distal common bile and pancreatic ducts as they cross the wall of the duodenum.

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Multiple Choice

A sheath of muscle fibers surrounding the distal common bile and pancreatic ducts as they cross the wall of the duodenum.

Explanation:
The Sphincter of Oddi is the muscular sheath surrounding the distal common bile duct and pancreatic duct as they traverse the wall of the duodenum at the major papilla. This circular smooth muscle regulates the flow of bile and pancreatic juice into the duodenum and prevents backflow. The other structures are located in different regions and serve other gates: the pyloric sphincter controls gastric emptying at the stomach–duodenum junction, the cardiac (gastroesophageal) sphincter prevents reflux at the esophageal–stomach junction, and the ileocecal valve sits between the ileum and the cecum.

The Sphincter of Oddi is the muscular sheath surrounding the distal common bile duct and pancreatic duct as they traverse the wall of the duodenum at the major papilla. This circular smooth muscle regulates the flow of bile and pancreatic juice into the duodenum and prevents backflow. The other structures are located in different regions and serve other gates: the pyloric sphincter controls gastric emptying at the stomach–duodenum junction, the cardiac (gastroesophageal) sphincter prevents reflux at the esophageal–stomach junction, and the ileocecal valve sits between the ileum and the cecum.

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