| aortic a.’es |
paired vessels arching from the ventral to the dorsal aorta through the branchial arches of fishes and amniote embryos. In mammalian development, arches 1 and 2 disappear; arch 3 joins the common to the internal carotid; the left arch 4 remains as the arch of the definitive aorta while the right arch 4 joins the aorta to the subclavian artery; arch 5 is absent or disappears; and the ventral halves of arch 6 form the pulmonary arteries while the connections to the dorsal aorta are lost, although the left half, or ductus arteriosus, serves until birth.
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| aortic a., cervical |
a rare, usually asymptomatic, congenital anomaly in which the aortic arch has an abnormally superior location, occasionally extending to the thoracic inlet or into the neck.
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| aortic a., double |
a congenital anomaly in which the aorta divides into two branches which embrace the trachea and esophagus and reunite to form the descending aorta.
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| aortic arch a. |
Takayasu's a.
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| aortic arch s. |
any of a group of disorders leading to occlusion of the arteries arising from the aortic arch; causes include atherosclerosis, arterial embolism, syphilitic or tuberculous arteritis, and other conditions. See also Takayasu's arteritis, under arteritis.
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