There are not just three coronary arteries. The two main branches are the left coronary artery and the right coronary artery, and the left coronary artery is divided into the left anterior descending branch and the left circumflex branch, as well as other small branches according to the different routes. 1. Left coronary artery: originates from the left coronary sinus at the root of the aorta, and according to its subsequent course, it is divided into the left anterior descending branch and the left circumflex branch. The left anterior descending branch travels down the anterior interventricular groove to the apex of the heart or lets bypass the apex of the heart, and its branches can be continued to the diagonal branch, etc.; while the left gyratory branch travels around the left auricle to the left atrioventricular groove, and its branches can be continued to the obtuse edge branch, etc. 2. Right coronary artery: originates from the right coronary sinus at the root of the aorta, usually traveling down to the right interatrial sulcus, and its branches can also be continued to the conical branches. If the coronary artery lesions, it is recommended to go to the regular hospital in time to avoid delays.