The ileum is the end part of the small intestine. It is extends from the jejunum, the middle part of the small intestine, to the beginning of the to the large intestine. The absorption of vitamin B12 and bile salts are among its most important functions.
In adult humans, the ileum is about 12 feet long and stretches up to the ileocecal valve, which connects to the large intestine. It is held in the abdominal cavity by a membrane called the mesentery, and receives blood supply from the superior mesenteric artery and the arterial branches.
Villi, or tiny projections, line the wall of the ileum. The ileum is the end part of the small intestine. It is extends from the jejunum, the middle part of the small intestine, to the beginning of the to the large intestine. The absorption of vitamin B12 and bile salts are among its most important functions.