“The widow maker is an alternate name for the anterior interventricular branch of the left coronary artery (LCA).  It oxygenates over 50% of the heart tissue, with its branches. The left main coronary artery branches into: Circumflex artery/Left Anterior Descending artery (LAD).

• This supplies the Circumflex artery – supplies blood to the left atrium, side and back of the left ventricle
• Left Anterior Descending artery (LAD) – supplies the front and bottom of the left ventricle and the front of the septum”.

American Heart Association (AHA)