The mesentery is a double fold of parietal peritoneum that connects the visceral peritoneum of the intestines to the parietal peritoneum of the posterior abdominal wall (where it arises as the mesenteric root). Not only does it hold the intestines in place, but many blood and lymph vessels plus nerves run in between the peritoneum layers to supply the abdominal organs. Besides the small intestine, the mesentery also connects parts of the colon with the abdominal wall, forming the transverse and sigmoid mesocolons as well as the mesoappendix.