The renal arteries normally arise off the side of the abdominal aorta, immediately below the superior mesenteric artery, and supply the kidneys with blood.Each is directed across the crus of the diaphragm, so as to form nearly a right angle with the aorta.ue to the position of the aorta, the inferior vena cava, and the kidneys in the body, the right renal artery is normally longer than the left renal artery. 1  The right passes behind the inferior vena cava, the right renal vein, the head of the pancreas, and the descending part of the duodenum.