Right coronary artery from the right aortic sinus
The right coronary artery (RCA) arises from the right aortic sinus, which is one of the three sinuses of Valsalva located at the base of the aorta. The sinuses of Valsalva are small dilations or pouches present at the origin of the aorta, just above the aortic valve.
The right coronary artery originates from the right aortic sinus and courses around the right side of the heart. It supplies blood to the right atrium, right ventricle, portions of the left ventricle (especially the posterior and inferior regions), and the atrioventricular node (AV node). The RCA also gives rise to the posterior descending artery (PDA), which supplies blood to the posterior part of the interventricular septum.
Again, I apologize for the previous incorrect statement, and thank you for bringing it to my attention.