The heart supplies blood to the outer regions of the body via the aorta, which leaves the heart via the left ventricle. The aorta branches off into various arteries throughout the body that function to supply blood to the body’s outer regions. When the aorta reaches the abdominal cavity it branches off into three unpaired arteries that supply blood to the digestive system. The first major branch is the celiac artery. It is this artery that supplies blood to the stomach, as well as to the spleen and liver. The second branch is the anterior mesenteric artery that supplies blood to the small intestine. And finally the last unpaired artery is the median sacral artery, which supplies blood to rectum.