There are three main arteries to the GI tract, the celiac trunk, the superior mesenteric artery, and inferior mesenteric artery. All three of these arteries are unpaired arteries arising from the abdominal aorta. The celiac artery goes to the foregut, the superior mesenteric to the midgut, and inferior mesenteric to the hindgut. We will see that the organization of the lymphatics and the nerve supply is all based on these three arteries. For instance, the celiac nodes are responsible for lymphatic drainage from the foregut, superior mesenteric nodes from the midgut, and inferior mesenteric nodes from the hindgut.