10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 2 2015 (April - June) Knowledge of the normal and variant anatomy and anomalies of coronary circulation is would be of use to cardiologists and interventional radiologist to predefine the abnormalities by invasive and non invasive studies. lessThan sup greaterThan 1 lessThan /sup greaterThan the present work was aimed to study the site of origin and distance from the supravalvular ridge, of right and left coronary arteries. 100 normal hearts with age group 20-60 years from nonspecific cadavers were included lessThan b greaterThan . lessThan /b greaterThan The interior of the three sinuses were examined to note the number of ostia. The ostium diameter of the right and left coronary arteries The relation of the level of the ostium is compared to the level of supravalvular ridge. In 82 the specimens the ostium is below the supravalvular ridge and in 4 of the specimens it is at the supravalvular ridge. 14 of the specimens it is above the supravalvular ridge. The left coronary artery ostium is situated in the left posteiro aortic sinus and in 86 of the specimens the ostium is present below the supravalvular ridge and in 6 of the specimens it is situated at the supravalvular ridge.8 of the specimens it is above the supravalvular ridge. The location,number, level of the ostium is very important in the successful performance of coronary angiogram and other invasive, noninvasive procedures and also determine the accurate size of cardiac catheters for interventional cardiology. DR.K.V.PAVANA KUMARI AND DR.K.D.V.SANTHI PRIYA coronary arteries,supra valvular ridge, angiogram,ostia. 1277-1282