Which portion of the aorta is located below the diaphragm?

The descending abdominal aorta is the section of the aorta that is situated below the diaphragm. The aorta has different segments, each defined by its anatomical location and relation to other structures.

The descending abdominal aorta begins at the level of the diaphragm, specifically at the aortic hiatus, and continues downward into the abdomen. This section of the aorta branches into several important arteries that supply blood to the abdominal organs and lower extremities.

The ascending thoracic aorta, descending thoracic aorta, and aortic arch are all positioned above the diaphragm. The ascending thoracic aorta travels upward from the left ventricle, while the aortic arch curves over the heart to give rise to major arteries that supply the head, neck, and arms. The descending thoracic aorta continues downward in the thoracic cavity, but it remains above the diaphragm until it passes through the aortic hiatus.

Because the question specifically asks for the portion located below the diaphragm, the descending abdominal aorta is the correct answer, as it is the only segment that exists in the abdominal cavity where it supplies various visceral branches to the lower organs.