1A: Drawing of the lateral view of the normal left coronary artery. 1B: Drawing of the lateral view of the left coronary artery as observed at autopsy. 1C: Schematic illustration of the left ventricle showing the three main coronary arteries and their tributary areas. 1D: Transverse section of the heart showing a wide infarcted area of the anterior portion of the interventricular septum. 1E: Superimposition of 1C and 1D. LCA= Left Coronary Artery. LDA= Left Descending Artery. LCx= Circumflex Artery. RCA= Right Coronary Artery.