aortic arches

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a·or·tic arch·es

a series of arterial channels encircling the embryonic pharynx in the mesenchyme of the pharyngeal arches. There are potentially six pairs, but in mammals the fifth pair is poorly developed or absent. The first and second pairs are functional only in very young embryos; the third pair is involved in the formation of the carotids; the fourth arch on the left is incorporated in the arch of the aorta; the sixth pair forms the proximal part of the pulmonary arteries.
References in periodicals archive ?
Papaioannou of Harvard Medical School found that embryonic mice without Tbx1 have malformations of the aortic arches, which become the major arteries leaving the heart.
Napoli of the University of California, San Diego, and colleagues found lipid-rich lesions in the aortic arches and abdominal aortas of all children.