any structural anomaly of the involuntary muscle comprising the myocardium of the heart and the walls of the pulmonary veins and superior vena cava; cardiac muscle is striated and multinucleate, and the cardiomyocytes branch and are joined to one another via intercalated discs
abnormal cardiovascular development +
abnormal eye muscle morphology +
abnormal heart morphology +
abnormal muscle development +
abnormal muscle fiber morphology +
abnormal muscle glycogen level +
abnormal muscle triglyceride level +
abnormal muscle weight +
abnormal skeletal muscle morphology +
abnormal smooth muscle morphology +
abnormal susceptibility to induced aneurysm formation +