The aorta is the body’s main artery that carries blood from the heart to the rest of the body. The section of the aorta that starts with the aortic valve in the heart and goes to the diaphragm is called the thoracic aorta. The part of the aorta that extends from the diaphragm through the abdomen is called the abdominal aorta. Dr. Patrick Vargo provides an overview of the aorta and when you may need surgery.