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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
The heart receives its own supply of blood from the coronary arteries. Two major coronary arteries branch off from the aorta near the point where the aorta and the left ventricle meet. These arteries and their branches supply all parts of the heart muscle with blood.1  Left Main Coronary Artery. 2  Right Coronary Artery. 3  Collateral Circulation.hese arteries and their branches supply all parts of the heart muscle with blood. 1  Left Main Coronary Artery. 2  Right Coronary Artery. 3  Collateral Circulation.