We have the thoracic descending an order and we have the abdominal descending an order. And basically the order extends and branches many times as we go down our body. And these branches form smaller arteries, eventually form arterios and then capillaries. And these capillaries are found within the organs and tissues found within the thoracic and within the abdomen portion of our body. Now eventually when we get down to our pelvic region, the descending an order and more specifically our abdominal descending order actually splits. And this splitting takes place in the following region.