Definition: "Middle subdivision of the digestive tract. The midgut is the portion of the embryo from which most of the intestines develop. After it bends around the superior mesenteric artery, it is often referred to as the \"midgut loop\". It comprises the portion of the alimentary canal from the end of the foregut at the opening of the bile duct to the hindgut, about two-thirds of the way through the transverse colon."