Medical Definition of Arch of the aorta

1. The curved portion between the ascending and descending parts of the aorta; it begins as a continuation of the ascending aorta posterior to the sternal angle, runs posteriorly and slightly to the left as it passes over the root of the left lung, and becomes the descending aorta as it reaches and begins to course along the vertebral column; it gives rise to the brachiocephalic trunk, the left common carotid and left subclavian arteries. Any member of the several pairs of arterial channels encircling the embryonic pharynx in the mesenchyme of the brachial 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. A series of arterial channels encircling the embryonic pharynx in the mesenchyme of the branchial arch's. 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. Synonym: arcus aortae. (05 Mar 2000)



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Lexicographical Neighbors of Arch Of The Aorta

arch-rivalries
arch-rivalry
arch-rivals
arch.
arch dell
arch dells
arch doxies
arch doxy
arch duke
arch dukes
arch enemy
arch length
arch length deficiency
arch of cricoid cartilage
arch of the aorta (current term)
arch of the palate
arch of thoracic duct
arch over
arch rival
arch rivalries
arch rivalry
arch rivals
arch rogue
arch support
archabbey
archabbeys
archabbot
archabbots
archae

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