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 ?
The descending aorta had thickened areas of increased consistency because of the presence of yellow plaques.
Four collateral arteries were noted between the descending aorta and the pulmonary artery (major aortopulmonary collaterals; MAPCAs), and one of them showed aneurysmal dilation (Fig.
Macroscopic lesions were apparent in the descending aorta and its branches to the level of the femoral arteries.
1) The most common site of injury is the proximal descending aorta, followed by the ascending aorta and aortic arch.
The Frenchman, aged 63, has been recuperating at home since being released from hospital following treatment for a dissected descending aorta.
In patients with acute aortic abnormality involving the distal descending aorta, the scan is often extended to the level of the aortic bifurcation for more complete assessment.
10) Typical findings on MDCT of an uncomplicated PDA would include a tubular structure connecting the descending aorta with the distal main pulmonary artery or the proximal left pulmonary artery.
The ductus arteriosus allows deoxygenated blood from the right ventricle through the descending aorta and to the placenta in the fetal period.
The therapy is accomplished with a unique, dual-balloon catheter placed in the descending aorta that works by restricting flow in the descending aorta and thus increasing blood flow to the brain.