<P> The ileum follows the duodenum and jejunum and is separated from the cecum by the ileocecal valve (ICV). In humans, the ileum is about 2--4 m long, and the pH is usually between 7 and 8 (neutral or slightly alkaline). </P> <P> Ileum is derived from the Greek word eilein, meaning "to twist up tightly". </P> <P> The ileum is the third and final part of the small intestine . It follows the jejunum and ends at the ileocecal junction, where the terminal ileum communicates with the cecum of the large intestine through the ileocecal valve . The ileum, along with the jejunum, is suspended inside the mesentery, a peritoneal formation that carries the blood vessels supplying them (the superior mesenteric artery and vein), lymphatic vessels and nerve fibers . </P> <P> There is no line of demarcation between the jejunum and the ileum . There are, however, subtle differences between the two: </P>

Where is the ileum located in the human body
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