Your digestive system is a big tube. One end is your mouth, the other end is your anus. In between there is your esophagus, stomach, small intestine and large intestine. It’s all connected in one line.
Edit, since I think I misunderstood your question: In order to keep your intestines from twisting around each other, there’s some connective tissue called mesentery that has blood vessels and what not in them and keeps them all from floating around. It connects them to the inside of your abdomen and some of the other internal organs.
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