Parts of duodenum

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The duodenum has the following four parts:

Superior part (Read more!) - the most proximal portion that connects with the pylorus of the stomach; part of it is located intraperitoneally;
Descending part (Read more!) - the second portion that contains two papillae (major duodenal papilla and minor duodenal papilla); positioned retroperitoneally;
Horizontal (inferior) part (Read more!) - the longest portion that crosses the third lumbar vertebra (L3) from the right to the left side; found retroperitoneally;
Ascending part (Read more!) - the final portion that continues as the jejunum at the duodenojejunal flexure; situated retroperitoneally.

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