These LCMA is the short proximal portion of the left coronay artery that originates in the left coronary cusps of the aortic valve. The orifice can be seen inside the sinus of Valsalva. From there it passes between the lateral aspect of the pulmonary trunk and the left auricle, along the coronary sulcus and quickly bifurcates into the LAD and the LCX arteries.

The LAD follows the anterior interventricular sulcus toward the apex of the heart. Branches of the LAD includes one or two diagonal branches that descend diagonally across the anterior surface of the LV as well as septal perforator branches that supply blood to a large portion of the interventricular septum.

From the LMCA bifurcation the LCx courses along the coronary sulcus and typically terminates before reaching the posterior interventricular sulcus.

The RCA typically originates from the right coronary cusps of the aortic valve and the orifice will be visible inside the sinus of Valsalva. From there it courses first between the right auricle and the pulmonary artery and then follows the right atrioventricular sulcus. Once it reaches the acute right margin of the heart it turns posteriorly.

• The conus branch is the first branch in 50%-60% of people and supply blood to the RVOT;
• The atrial branch passes in the groove between the right auricle and the ascending aorta;
• the sinus node artery originates from the RCA in the mjority of people (66%) or from the eft coronary artery (34%) to supply the sinus node;
• the right marginal branch runs along the anteroinferior border known as the acute margin (margo acutus) toward the cardiac apex. It supplies blood to the RV free wall;
• the atrioventricular (AV) nodal branch is a small branch to the atrioventricular node;
• the posterior interventricular branch is the final major branch, which lies in the posterior interventricular sulcus.

• Coronary sinus
• Great cardiac vein
• Middle cardiac vein
• Small cardiac vein
• Left marginal vein