Abstract
Anatomically the thoracic aorta is divided into a several distinct segments (Figure 1.1). The ascending aorta extends from the left ventricle (at the aortic annulus) and rises in the anterior mediastinum to the innominate artery. The base of the ascending aorta is referred to as the aortic root. The root is the widest aortic segment and is comprised of three coronary sinuses, which bulge outward, and serves as the support structure for the aortic valve cusps. The portion of the ascending aorta above the root is narrower and tubular in shape. Distal to the ascending aorta is the aortic arch, which moves posteriorly and to the left in the superior mediastinum, extending from the innominate artery to the ostium of the left subclavian artery. Thereafter, the descending aorta courses posteriorly, adjacent to the vertebral column, and continues to the level of the diaphragm, after which it becomes the abdominal aorta.
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Isselbacher, E.M. (2007). Epidemiology of Thoracic Aortic Aneurysms, Aortic Dissection, Intramural Hematoma, and Penetrating Atherosclerotic Ulcers. In: Eagle, K.A., Baliga, R.R., Isselbacher, E.M., Nienaber, C.A. (eds) Aortic Dissection and Related Syndromes. Developments in Cardiovascular Medicine, vol 260. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-36001-0_1
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