The mesentery is a fold of tissue in the abdomen that attaches the intestines to the posterior abdominal wall. It helps support the intestines and contains blood vessels, nerves, and lymphatics that supply the intestines. This structure plays a crucial role in maintaining the position of the intestines and facilitating their function. Recent studies have shown that the mesentery is more than just a supportive structure; it is also involved in immune responses and fat storage. Understanding the mesentery can provide insights into various gastrointestinal diseases and conditions, including those related to the small intestine and large intestine.