Abstract: Objective To provide evidence for establishing animal model, and to investigate the effects of myocardium bridge on ischemic myocardium.Methods The left and right coronary artery and their branches of 41 cases of dogs’ hearts were anatominged and observed. Results Myocardium bridges appeared on dogs’ hearts in 29 cases out of 41 cases；1、2、3、4、5 myocardium bridges appeared respectively in 14 cases （of 34.1%）、7 cases （of 17.1%）、6 cases （of 14.6%）、1 cases （of 2.4%）、1 cases （of 2.4%）.The myocardium bridge appeared on anterior interventricular，posterior interventricular branch, on anterior branch of the left venteicle,on posterior branch of the left ventricle, on the left marginal branch,and the left branch of conus 1 leases （26.83%）, 5 case （12.20%）, 3 cases （7.32%）, 2 cases （4.88%）, 1 cases （of 2.44%） respectively.The angle between the fibers of the myocardium bridge and nural coronary artery is 68.94°±14.38°,the width of the myocardium bridge is 7.77土5.05 mm,and the thickness of the myocardium bridge is 0.56士0.61 mm.Conclusion Dogs’ myocardium bridges are similar to that of human,so dog is the ideal modles for studying the effects of myocardium bridge on ischemic myocardium.

Key words: Dog, Myocardium bridge, Nural coronary artery, Observation, Conparison