What is the ramus coronary artery?

The third artery: Normally the main coronary blood vessel has two branches--the left anterior descending artery and left circumflex, but some people have a third branch termed intermediate artery or ramus-coronary artery--see picture. The incidence is some where between 10-30%. This can cause some confusion in ekg interpretation if this vessel is blocked/causing a heart attack. Consult doc. Good luck.

Add'l named artery: In humans usually two main coronary arteries come off the aorta to feed the heart muscle. The right coronary feeds the right side of the heart and some of the muscular wall between the two sides. The left coronary divides into the left anterior descending artery (lad) and the circumflex coronary artery (cfx). Sometimes there is a third artery between the LAD and the cfx, the ramus intermedius.