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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
The duodenum is the upper part of the small intestine, into which food flows from the stomach. The papilla forms the main exit hole for the bile and pancreatic juices which flow down the bile duct and pancreatic duct.