AbstractTo know the variation in origin of right and left coronary artery. Location and position of each coronary ostium was noted with respect to aortic sinus and sinotubular junction. Number of ostia and diameter of ostium were noted.The present study was undertaken on 70 adult human hearts specimens from embamed cadavers. Hearts were dissected and studied. Present study showed that in all 70 heart specimens three aortic sinuses i.e. anterior, left posterior, right posterior were present. The right coronary artery was found to be arising from anterior aortic sinus in 100% specimens and left coronary artery was arising from left posterior aortic sinus in 100% cases. In 90% (63) specimens right coronary artery arises below sinotubular junction, 10% (7) at sinotubular junction and no case above sinotubular junction was found. For left coronary artery 88.57% (62) cases, ostia were located below sinotubular junction, 11.43% (8) at the sinotubular junction and no case above sinotubular junction was noted. Single ostium was present in 80 (56) cases and two ostia were present in 20% (14) in anterior aortic sinus. In left posterior aortic sinus, single ostium was present in all 100% cases. No opening was seen in right posterior aoric sinus. The mean diameter of right coronary ostium was 3.22±0.82mm while left coronary artery showed 4.51±0.70mm.
Keywords: Aortic Sinus; Right Coronary Artery; Left Coronary Artery; Coronary Ostia; Ostium Diameter; Sinotubular Junction