The small intestine is the gut region between stomach and large intestine, divided into duodenum, jejunum and ileum. It performs extensive digestion and absorption. Surface organization and segment-specific transport link its anatomy to the processing of different nutrients.[ref]
The ileum is the distal part of the small intestine before entry into the large intestine. Its specialized transport includes recovery of bile-associated material and absorption of vitamin B12 under the appropriate carrier conditions. It also contains prominent gut-associated lymphoid structures.
The duodenum is the first small-intestinal segment after the stomach. Pancreatic and biliary secretions enter its region to support digestion and modification of gastric contents. Its anatomy connects digestive secretions from accessory organs with material arriving through the pylorus.
A predominantly mucous gland of the duodenum whose ducts communicate with intestinal crypts.

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