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Normal Anatomy

Anterior view of coronary arteries: These illustrations show the right and left main coronary arteries and their branches. The right coronary artery originates from the anterior portion of the right coronary sinus. This right coronary artery travels near the edge of the right atrial appendage and gives rise to the sino-atrial branch (in 60% of humans), the conus branch, atrial branches, and then gives rise to the right marginal artery anteriorly and continues as the right coronary posteriorly. The right coronary artery terminates as the posterior descending artery, also called the right posterior interventricular branch. The left main coronary artery originates from the superior portion of the left coronary sinus. The left main coronary artery divides into the left anterior descending (LAD), also called the left interventricular branch and the left circumflex branch (posterolateraly). The LAD travels along the anterior interventricular groove of the heart and gives rise to diagonal branches to the surface of the left ventricle, deeper penetrating septal branches, and lateral branches.