The vessels supplying the heart muscle mass with bloodstream abundant with oxygen. They have been called the coronary arteries simply because they encircle the heart in how of a top. The term "coronary" comes from the Latin "corona" and Greek "koron" indicating crown. Like many arteries, the coronaries may be at the mercy of arteriosclerosis (hardening for the arteries). There are certain coronary arteries. Those most often bypassed today range from the right coronary artery, the posterior descending coronary artery, the left main coronary artery, the remaining anterior descending coronary artery plus the left circumflex coronary artery. Plaques obstructing the coronary arteries can also be treated by balloon angioplasty, stents as well as other practices.