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The diaphragm.
abdominal aorta is the portion of the descending aorta inferior to the diaphragm. it passes thru a hole in the diaphragm called aortic hiatus
The diaphragm divides the thoracic and abdominal aorta. These are both parts of the descending aorta, extending from the aortic arch.
abdominal aorta The Abdominal aorta is the longest section of the aorta, beginning at the diaphragm and spanning the abdominal cavity. The Thoracic and abdominal aorta together make up the descending aorta.
Inferior part of the aorta
The Aorta is the biggest artery, and the Superior and Inferior Vena Cava are the largest veins.
abdominal aorta
The abdominal aorta (and inferior vena cava for that matter) is a primary retroperitoneal structure.
Celiac, superior and inferior mesenteric arteries
The inferior vena cava
The superior and inferior vena cava.
The aorta. The Superior and Inferior Vena Cavas are the biggest veins in the body. Hope this helps.