**6.2 Deep-seated atrioventricular bundle**

Deep-seated HB (type II) was found in 34 subjects out of 105 (32.4%). The atrioventricular bundle is clearly distinguished from the membranous part of the IVS and lays within the muscular portion of the IVS (**Figure 4**). In such cases, even in the clear identification of HB signal, it is a rare occurrence of adequate HBP.
