abnormal myocardial fiber morphology abnormal intercalated disc morphology MP:0006267 MPheno.ontology any structural anomaly in the electron dense junctional complex, at the end to end contacts of cardiac muscle cells, that contains two types of membrane junctions i.e. gap junctions and desmosomes; the intercalated discs permit communication between the cells such that there is a sequential contraction of the cells from the bottom of the ventricle to the top, facilitating maximal ejection of blood from the ventricle during contraction