- The mesentery, which connects the intestine to the abdomen, has been classified as a single organ
- The organ's continuity can be seen only when it's exposed in a certain way
(CNN)In case you've ever wondered what connects your intestine to your abdomen, there's a word -- and now, a single organ -- for that: the mesentery. But don't worry; you haven't grown a new organ. It's always been there, performing important functions that affect systems throughout the body, from cardiovascular to immunological.