Recently coronary artery disease and anomalies have emerged as the most common cause of sudden cardiac death in fitness freak people and young athelets..In the management of congenital and acquired cardiac diseases, the morphological anatomy of coronary circulation and its variations is of paramount importance. . Most common artery involved in ischemic heart disease is Anterior interventricular artery ( Left anterior descending) which is branch of left coronary artery So study of human cadaveric heart for morphological details of let coronary artery for origin, length, branching patterns and diameter and their variation in unrecognized population of Delhi NCR and Western U.P is a way to understand the variations and anomalies for better management. Objective: To study the origin, length, diameter and patterns of branching and their variation of left coronary artery in hearts of human cadavers. Method: 40 adult cadaveric heart specimens of unspecified age group and sex were dissected and the origin and variation of artery were observed. Results: Out of 40 heart specimens, the origin of left coronary was from i posterior aortic sinus in all specimen. In 27 specimens bifurcation was found , in 12 specimens trifucation was found and in 1 specimen quadrification was found. and no cases of pentafurcation. Conclusion: It is very significant to know the normal and variant branching pattern for early diagnosis and treatment of coronary arteries. Therer are magnitude of studies of left coronary artery and its variations but area specific study has importance for better management of ischemic heart diseases