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. So these two arteries are called the common iliac arteries. So we have a left common iliac artery and a right common iliac artery. And as they extend down they split many more times.