What Is a Jejunostomy Tube?

The length of the small intestine varies with age, and there are considerable individual differences. The mesentery of the jejunum and ileum are attached to the posterior abdominal wall, starting from the left side of the second lumbar vertebra and ending in front of the sacroiliac joint. The jejunum accounts for about 40% of the small intestine and 60% of the ileum. There is no clear boundary between the two. Generally speaking, the jejunum has a larger diameter and thicker intestinal wall. The jejunal mesentery has only one layer of vascular arch. The ileum intestinal wall is thin and thin.