abnormal atrioventricular bundle morphology abnormal left posterior bundle morphology 2010-10-04T04:02:04Z MP:0010566 MPheno.ontology abnormal left bundle of atrioventricular bundle abnormal left crus of atrioventricular bundle abnormal left ventricular bundle branch morphology any structural anomaly of the left branch of the atrioventricular bundle that separates at the bundle of His, descends the septal wall of the left ventricle and connects to the terminal Purkinje fiber csmith