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The small intestine is about 6-7 meters long.

The first portion is called the duodenum and is about 20-25 cm long. There are 4 parts to the duodenum: (1) superior portion, (2) descending poriton, (3) inferior protion, (4) ascending poriton.

The second protion is called the Jejunum and the proximal 2/5 of the small intestine (excluding the duodenum).

The last portion is called the Ileum and composes the distal 3/5 of the small intestine.

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