Cardiac problems are encountered in the clinic more nowadays. Many of the cardiac problems and procedures have impact on the Sinu-atrial nodal artery which is the pace-maker of the heart. Variations of Sinu-atrial nodal artery and its knowledge is must in understanding cardiac problems and conducting clinical practices. Thirty hearts from the cadavers were taken for the study. The hearts were dissected, Sino-atrial nodal artery were exposed and analyzed. Sinu-Atrial nodal artery did not arise from arteries other than the right coronary artery. The level of origin differed in different specimens. In 10% of the specimens, it originated from the length interval of 6-10 mm, in 40% from the length interval of 11-15 mm, in 23.33% from the length interval of 16-20 mm, in 13.33% from the length interval of 21-25 mm and in 10% from the length interval of 26-30 mm from the origin of right coronay artery. In one of the specimen it was found to originate from the right coronary artery at a length of 55mm from its origin which was near the inferior margin of the heart. The course was retrocaval in all of the specimens. No extra origin of the artery was found