Aortic arch


Aortic arch
The aortic arch is the second section of the aorta, the largest artery in the body. The aorta arises from the left ventricle of the heart and first goes up, then bends, and goes down. The part that goes up is termed the ascending aorta, the part that bends is the arch of the aorta, and the part that goes down is the descending aorta. The aortic arch gives off, in order, the brachiocephalic trunk and the left common carotid and subclavian arteries. The brachiocephalic trunk, the first branch off of the aortic arch, subsequently splits to form the right subclavian and the right common carotid arteries that supply blood to the right arm and right side of the neck and head. (Brachio- = arm; and -cephalic = head). The left common carotid artery and left subclavian artery, the second and third branches off of the aortic arch, perform parallel functions on the left side. Like the other sections of the aorta, the aortic arch is an arbitrary anatomic entity. The aorta is one continuous conduit that stems from the left ventricle of the heart to carry blood to most of the body. The arch of the aorta is nonetheless a hallowed and convenient subdivision of the aorta. In anatomy, an arch is any structure with a curved or bowlike contour, that bends, like the arch of the aorta.

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aortic arch n
1) one of the arterial branches in vertebrate embryos that exist in a series of pairs with one on each side of the embryo, that connect the ventral arterial system lying anterior to the heart to the dorsal arterial system above the alimentary tract, and that persist in adult fishes but are reduced or much modified in the adult of higher forms
2) ARCH OF THE AORTA

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that part of the aorta that extends from the ascending aorta, upward over the heart and then backward and down as far as the fourth thoracic vertebra. stretch receptor in its outer wall monitor blood pressure and form part of the system maintaining this at a constant level.

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1. arcus aortae. 2. any of a group of paired vessels arching from the ventral to the dorsal aorta through the branchial arches of fishes and the pharyngeal arches of 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 as an arterial shunt until birth.

Medical dictionary. 2011.

Look at other dictionaries:

  • Aortic arch — Infobox Artery Name = PAGENAME Latin = arcus aortae GraySubject = 142 GrayPage = 547 Caption = Plan of the branches. Caption2 = The arch of the aorta, and its branches. BranchFrom = ascending aorta BranchTo = brachiocephalic artery, left common… …   Wikipedia

  • aortic arch — noun the part of the aorta that arches and turns downward • Hypernyms: ↑aorta * * * noun : one of the branches that arise from the ascending aorta in pairs in fishes and the embryos of higher vertebrates and pass to the gill clefts of either side …   Useful english dictionary

  • aortic arch — aor′tic arch′ n. one member of a series of paired curved blood vessels that arise in the embryo from the ventral aorta, pass around the pharynx through the branchial arches, and join with the dorsal aorta to form the great vessels of the head and …   From formal English to slang

  • aortic arch — noun Date: 1868 one of the arterial branches in vertebrate embryos that exist in a series of pairs with one on each side of the embryo, connect the ventral arterial system lying anterior to the heart to the dorsal arterial system above the… …   New Collegiate Dictionary

  • aortic arch — Embryol. one member of a series of paired curved blood vessels that arise in the embryo from the ventral aorta, pass around the pharynx through the branchial arches, and join with the dorsal aorta to form the great vessels of the head and neck.… …   Universalium

  • aortic arch — that part of the aorta that extends from the ascending aorta, upward over the heart and then backward and down as far as the fourth thoracic vertebra. Stretch receptors in its outer wall monitor blood pressure and form part of the system… …   The new mediacal dictionary

  • aortic arch syndrome — ▪ pathology       group of disorders that cause blockage of the vessels that branch off from the aorta in the area in which the aorta arches over the heart. The aorta is the principal vessel through which the heart pumps oxygen rich blood into… …   Universalium

  • aortic arch syndrome — 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 arteritis, under… …   Medical dictionary

  • aortic arch syndrome — noun Takayasus arteritis …   Wiktionary

  • aortic arch arteritis — Takayasu a …   Medical dictionary


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