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Aortic arch: The second section of the aorta following the ascending aorta. As it continues from the heart, it gives off the brachiocephalic trunk, and the left common carotid and subclavian arteries. The brachiocephalic trunk splits to form the right subclavian and the right common carotid arteries, which supply blood to the right arm and the right side of the neck and head.
pl. aortae, aortas [L.] the great artery arising from the left ventricle, being the main trunk from which the systemic arterial system proceeds. See Table 9. See also aortic. abdominal aorta. the part of the descending aorta within the abdomen. ascending aorta. the first part of the aorta which passes dorsally and cranially. descending aorta. the aorta after it turns caudally at the aortic arch. overriding aorta. see overriding aorta. supravalvular aorta. the portion of aorta immediately above the aortic valve. terminal aorta. the segment of the aorta immediately before it divides into the iliac arteries.