Retroperitoneal structure among the following is:
Duodenum begins at the Duodenal bulb. It travels in the retroperitoneal space around the head of the pancreasIt returns to peritoneal cavity at the ligament of TreitzThe rest of the small intestine is in the peritoneal cavity It is suspended by mesentery, 40% composed by jejunum, 60% by ileum Ref: Sleisenger, E - 9, p - 1615.
Second pa of Duodenu
Proximal jejunum
Distal jejunum
Distal ileum