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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).
of or pertaining to the duodenum. duodenal glands. glands in the submucosa of the duodenum, opening into the small intestine; called also Brunner's glands.