THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Thoracic aorta becomes abdominal aorta after passage through the diaphragm. It remains a retroperitoneal structure along its entire course. The first branch of the abdominal aorta is the celiac trunk, followed by the superior mesenteric artery and paired renal arteries (Figure 5).

Detailed explanation-2: -The thoracic aorta originates from the left ventricle, guarded by the aortic valve. Just above the cusp of the aortic valve, the aorta gives off the left and right main coronary arteries that run along coronary grooves of the heart and are responsible for perfusion of the myocardium.

Detailed explanation-3: -The thoracic aorta begins at the aortic arch and runs anterior to the middle axis of the vertebral body. The position of the aorta changes with the arrangement of spine.

Detailed explanation-4: -Results: In supine position, the aorta is positioned left lateral to the vertebral body at midthoracic levels (T4-T8) and more anterior to the vertebral body at lower thoracic levels (T9-L2).