From an LAO perspective, the left anterior descending artery and right posterior descending artery run vertically while the coronary septum loop is seen edge-on and the AV groove loop is seen face-on, with the right coronary artery forming a "C" and the circumflex forming a backwards "C". From the RAO projection, the anterior and posterior descending coronaries run from the base of the heart left to the apex right, while the circumflex and right coronary arteries run vertically parallel to the loop they form at the heart base.