J) Small Bowel

The small bowel is a long and mobile stretch of the digestive system. It rarely develops malignancy and is therefore not a major topic of interest for the focused section. It will be covered in more depth in the general anatomy topic.

The small bowel consists of the duodenum, jejenum and ilium. The duodenum is retroperitoneal, and is usually the most posterior of the small bowel loops seen on CT.
In contrast, the jejenum and ilium are suspended within the peritoneal cavity on The Mesentery. This allows them to be highly mobile within the cavity, which is relevant for pelvic treatments as they can often be found resting on the pelvic organs or in the pouches between them.