aorta


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aorta

(āôr`tə), primary artery of the circulatory systemcirculatory system,
group of organs that transport blood and the substances it carries to and from all parts of the body. The circulatory system can be considered as composed of two parts: the systemic circulation, which serves the body as a whole except for the lungs, and the
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 in mammals, delivering oxygenated blood to all other arteries except those of the lungs. The human aorta, c.1 in. (2.54 cm) in diameter, originates at the left ventricle of the heartheart,
muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and Function

The human heart is a pear-shaped structure about the size of a fist.
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. After supplying the coronary arteries that nourish the heart itself, the aorta extends slightly toward the neck to feed branches serving the head and arms. It then arches down toward the waist, directing blood into the arterial system of the chest. Entering the abdomen through the aortic hiatus, an opening in the diaphragm, the aorta branches off to supply the stomach, kidneys, intestines, gonads, and other organs through extensive arterial networks. It finally divides into the two iliac arteries carrying blood to the legs. The elasticity of the aorta wall permits it to pulse in rhythm with the heartbeat, thus helping to propel blood through the body.

Aorta

 

the main artery of the greater circulatory system, which supplies blood to all organs of the body.

The wall of the aorta consists of three membranes, that is, the interior (a layer of endothelial cells), intermediate (numerous rows of elastic fibers), and exterior (bundles of connective tissue fibers). Because of the elasticity of the aorta’s walls an uninterrupted flow of blood in the arteries is assured. In man, mammals, and birds, the aorta emerges from the left ventricle of the heart, forming an enlargement at its very beginning, called the aortic spindle, goes up (ascending aorta), turns back and to the left in man and mammals (arch of the aorta) and back and to the right in birds, and goes down (descending or dorsal aorta). In reptiles there are two aortic arches, that is, the right, or arterial, arch, emerging from the left ventricle of the heart; and the left, or venous, arch from the right ventricle. When they unite, they form a common aorta with mixed blood. In amphibians an arterial cone emerges from the only ventricle, and from it one pair (in ecaudates) or two pairs (in caudates) of aortic arches branch out, which form the dorsal aorta when they unite. In fishes and cyclostomes the ventricle passes into the abdominal aorta, which carries venous blood through the system of arterial arches into the gills (in fishes) and gill pouches (in cyclostomes). The blood which is oxygenated there is collected in the dorsal aorta. Of the invertebrates, mollusks and arthropods have aortas.

REFERENCES

Ostroverkhov, G. E., D. N. Lubotskii, and Iu. M. Bomash. Kurs operativnoi khirurgii i topograficheskoi anatomii,2nd ed. Moscow, 1964.
Cole, W. H. Textbook of Surgery,8th ed. New York, 1963.

aorta

[ā′ȯrd·ə]
(anatomy)
The main vessel of systemic arterial circulation arising from the heart in vertebrates.
(invertebrate zoology)
The large dorsal or anterior vessel in many invertebrates.

aorta

the main vessel in the arterial network, which conveys oxygen-rich blood from the heart to all parts of the body except the lungs
References in periodicals archive ?
As indicated in the introduction, coarctation of the aorta may exist in the presence of other important intracardiac and/or extracardiac lesions.
2+]-induced contractions of the aorta rings were elicited by the cumulative addition of Ca[Cl.
Other surgical factors associated with the later development of aortobronchial fistula are coarctation of the aorta, (11) correction of congenital abnormalities (e.
Computed tomography angiography (CTA) of the aorta is the reference method to investigate aortic disease and to follow up patients after surgical or endovascular aortic repair, either thoracic or abdominal.
Coarctation of aorta can cause severe left ventricular dysfunction1 and it can be missed in small child if meticulous echocardiographic evaluation is not done.
A major weakness in the replacement of the aortic valve and ascending aorta with CVG is bleeding from the proximal suture line.
Her CT scan findings suggested bicuspid aortic valve, severe juxtaductal aortic coarctation, and postcoarctated descending thoracic aorta (DTA) that was mildly dilated.
Fortunately, the tough, elastic aorta tends to develop a bulge before it breaks.
Although the results of manual segmentation are the most accurate, automatic aorta segmentation still has practical advantages over the manual segmentation approach.
Since cardiopulmonary bypass is generally carried out via the cannulation from the left atrium and the descending aorta, there exists a risk of micro-emboli escaping into the cerebral circulation.
The right superior testicular artery took origin at the normal level and crossed right ureter, right psoas major muscle and inferior vena cava while the right inferior testicular artery took origin 3 cm below the superior testicular artery above bifurcation of abdominal aorta and crossed right common iliac artery.