In which sulcus do the right coronary artery (RCA) and left coronary artery (LCA) reside?

The coronary sulcus, also known as the atrioventricular groove, is the anatomical structure that houses the right coronary artery (RCA) and the left coronary artery (LCA) as they encircle the heart. This sulcus separates the atria from the ventricles and plays a crucial role in supplying blood to the heart muscle. The RCA originates at the right aortic sinus and courses along the coronary sulcus, providing blood flow to the right atrium, right ventricle, and, in some individuals, the inferior part of the left ventricle. Similarly, the LCA arises from the left aortic sinus and also travels within the coronary sulcus, giving off branches that supply the left atrium and left ventricle, as well as part of the interventricular septum.

The other options refer to different anatomical structures. The atrioventricular sulcus is essentially another name for the coronary sulcus. The interventricular sulcus, on the other hand, divides the right and left ventricles and is not where the major coronary arteries reside. Lastly, the posterior interventricular sulcus is a specific part of the interventricular sulcus located on the posterior side of the heart, primarily