The root connects the jejunum and ileum regions of the small intestine to the posterior abdominal wall. These are the two areas of the small intestine just before where the organ connects with the large intestine. The root is about 15 centimeters long and sits centrally in the abdominal cavity, behind the transverse colon. When the mesentery attaches to the colon at the gastrointestinal margin, it becomes the regions of the mesocolon.

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