Encyclopedia > Coronary artery

  Article Content

Coronary circulation

Redirected from Coronary artery

The coronary circulation consists of the blood vessels that supply blood to, and remove blood from, the heart. These relatively narrow vessels are commonly affected by atherosclerosis and can become blocked, causing angina or a heart attack. (See also: circulatory system)

The coronary arteries run on the surface of the heart and are therefore called epicardial coronary arteries. These arteries, when healthy, are capable of autoregulation to maintain coronary blood flow at levels appropriate to the needs of the heart muscle (myocardium).

The exact anatomy of the myocardial blood supply varies considerably from person to person. A full evaluation of the coronary arteries requires cardiac catheterization[?].

In general there are two main coronary arteries, the Left and Right.

The left coronary artery (LCA) arises from the aorta in the left cusp of the aortic valve as the Left Main (LM) artery and eventually divides into two major arteries: the Left Anterior Descending (LAD), from which various Diagonal (D) and Septal (S) branches arise; and the Circumflex (Cx) Artery, from which Obtuse Marginal (OM) branches arise.

The right coronary artery (RCA) arises from the aorta in the right cusp of the aortic valve, and divides into a major branch, the Posterior Descending (PD) artery, and several smaller branches, including the Conus Branch (CB), the Sinus Node branch (SN), the Acute Marginal (AcM), and the Posterolateral left ventricular (PL) artery.

Depending on which artery supplies the greater portion of the myocardium, a person's coronary circulation can be classifed as "right-dominant" or "left-dominant".

The coronary arteries are classified as "end circulation", since they represent the only source of blood supply to the myocardium: there is no redundant blood supply, which is why blockage of these vessels can be so critical.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Northampton, Suffolk County, New York

... out with 29.3% under the age of 18, 9.6% from 18 to 24, 30.3% from 25 to 44, 20.9% from 45 to 64, and 9.8% who are 65 years of age or older. The median age is 34 years. ...

 
 
 
This page was created in 44.6 ms