The end of the diastole 0.12 s later than Figure 1. The limit was visible between the right and the left muscular part of the IVS formed of the opposing fetal medial walls of the RV and the LV (low arrow). The openings of the interventricular vessel (kuuselian vessel) into the LV were visible between the interventricular sphincter in the left central muscular part of the IVS (high arrow).