The conducting tissues in primitive ventricle with outlet chamber. Two different possibilities

The conducting tissues have been studied in two cases of primitive ventricle with outlet chamber. In one case the outlet chamber was to the right and in the other, to the left. In both cases there was an anterior node related to the anterior part of the right atrioventricular anulus. In the specimen with a left-sided outlet chamber (l-loop), the bundle passed through the atrioventricular-semilunar fibrous continuity and was intimately related to the posterior artery. Such a relation was absent in the specimen with a right-sided outlet chamber (d-loop), wherein the bundle directly descended on the posterior part of the septum between the main and outlet chambers. The septum is not considered to be the true ventricular septum but rather a hypertrophied trabecula septomarginalis.