If you are talking about where does the blood inside the descending aorta come from, it comes from the aortic arch, which comes from the ascending aorta.
If you are talking about the blood that nourishes the tissues of the aorta, it is the vasa vasorum.
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blood travels from the ascending aorta to the aortic arch to the descending aorta
The largest blood vessel in the abdomen is the descending aorta.
Descending aorta
The descending aorta is the major blood vessel that supplies blood to the caudal half of a pig.
The largest vessel attached to the heart is the Aorta, and it is responsible for delivering blood to the body. It is categorized in 2 groups, the Ascending Aorta and the Descending Aorta. The Ascending aorta includes the Carotid Arteries, which deliver blood to the brain, and the Subclavian Arteries, which brings blood to the arms. The Descending Aorta is located in the thoracic cavity with the rest of the heart and Aorta and is the part of the Aorta that curves down toward the bottom of the body and branches off into other arteries which supply the bottom portion of the body with blood.
oxidized blood
Blood goes in this order... Right Atrium -> Right Ventricle -> Lungs -> Left Atrium -> Left Ventricle -> Ascending Aorta -> Descending Aorta. So neither pump blood to the the Left Ventricle but the Left Ventricle pumps blood to the ascending aorta.
Aorta
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aorta
Aorta
The large blood vessel is called the aorta.