Ileum - Definition

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The ileum is part of the digestive system, located in the third and final part of the small intestine. It comes after the jejunom and is followed by the cecum, or the first part of the colon. Although smaller in diameter than the jejunum, the ileum still typically measures nearly 4 meters in length. This organ has Peyer's patches on its intestinal mucous membrane, and ensures the absorption of nutrients such as potassium, sodium, water, bile salts, and vitamin B12.