The conus artery usually is the first branch of the Right coronary artery, supplying mostly the region of the Pulmonary infundibulum. This artery sometimes takes a separate origin from the anterior aortic sinus. forming an additional coronary artery besides the right and left coronary arteries. Such an artery is known as the Third Coronary artery (TCA). This artery often anastomoses with a similar branch from the anterior interventricular artery to from the annulus of Vieussens, that forms an important anastomotic channel of the heart. The occurrence of the Third coronary artery however has shown wide variations in different studies across the world, ranging from 0 % to 51%. This study therefore aims to study the Third coronary artery mainly its origin, course and distribution