The sinoatrial nodal artery usually arises from the right coronary artery or circumflex branch of left coronary artery or from both right and left coronary arteries. Hence present study was planned to assess the accurate identification of coronary arterial branches. As this is important in the interpretation and description of coronary arteries in surgery and angioplasty conditions. The study was planned on 50 heart subjects. These selected hearts are without any obvious pathology referred with cardiac conditions was enrolled into the study in Patna Medical College, Patna, Bihar. The coronary arteries were dissected and analysed for the origin of sinoatrial Nodal artery and Observations were noted. The 76% cases showed sinoatrial nodal artery originating from proximal segment of the right coronary artery and in 16% cases sinoatrial nodal artery were originating from the left coronary artery. The results of the present study may help cardiac surgeons, particularly during surgical correction of certain valvular disorders and congenital malformations of the coronary arteries.