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Human Duodenum, 400X TBO, 2um
The duodenum also known as dodecadactylum, is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In humans, the duodenum is a hollow jointed tube about 25?38 cm (10?15 inches) long connecting the stomach to the jejunum. It begins with the duodenal bulb and ends at the suspensory muscle of duodenum. Under microscopy, the duodenum has a villous mucosa. This is distinct from the mucosa of the pylorus, which directly joins to the duodenum. Like other structures of the gastrointestinal tract, the duodenum has a mucosa, submucosa, muscularis externa, and adventitia. Glands line the duodenum, known as Brunner’s glands, which secrete mucus and bicarbonate in order to neutralise stomach acids. These are distinct glands not found in the ileum or jejunum, the other parts of the small intestine.