When we referred to blood supply, we generally talk about specific tissues or organs. There are pretty good and anatomy references, showing the blood supply to various tissues of the abdominal wall. The blood supply that is most important in context to this procedure are blood vessels that come through rectus abdominis muscle, and are branches off of the inferior epigastric artery. The artery sub divides into multiple branches through the rectus abdominis muscle, including typically three perforator arteries that go up through the fat layer to the skin surface on each side. During the procedure as the skin and fat layer is separated from the muscle fascia. These typically six perforator vessels are transacted. This terminates the primary blood supply to the skin of the front of the abdomen, which is now forced to rely on the secondary blood supply coming from the periphery. If the peripheral blood supply is insufficient, then there will be ischemia of the central lower abdominal skin. This can be made worse by putting the skin under significant tension. I suggest referring to anatomy text or images which can describe the anatomy, including its blood supply in far greater detail. Best, Mats Hagstrom, MD