THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The middle part of the small intestine. It is between the duodenum (first part of the small intestine) and the ileum (last part of the small intestine). The jejunum helps to further digest food coming from the stomach.

Detailed explanation-2: -The small intestine (small bowel) lies between the stomach and the large intestine (large bowel) and includes the duodenum, jejunum, and ileum. The small intestine is so called because its lumen diameter is smaller than that of the large intestine, although it is longer in length than the large intestine.

Detailed explanation-3: -Etymology. Jejunum is derived from the Latin word jējūnus, meaning “fasting.” It was so called because this part of the small intestine was frequently found to be void of food following death, due to its intensive peristaltic activity relative to the duodenum and ileum.

Detailed explanation-4: -The small intestine is about five times longer than the large intestine but has a smaller diameter (about 2.54cm versus 7.62cm), which is why it is called ‘small’. It comprises the duodenum (25cm), jejunum (around 2.5m) and ileum (around 3.5m).