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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 first segment of the small intestine and is also the shortest (about 25 centimeters, or roughly 10 inches). It starts at the pylorus and ends at the duodenojejunal junction. It has four parts: Superior part: Horizontal to and in front of the 1st lumbar vertebra.