Which of the following can be found in the interventricular septum?

SA node is a patch of nodal tissue is present in the right upper corner of the right atrium. 

AV node is seen in the lower left corner of the right atrium close to the atrio-ventricular septum.

AV bundle arises from the AV node and passes through the atrio-ventricular septum to emerge on the top of the interventricular septum and immediately divides into a right and left bundle branches.

Chordae tendineae are found in the ventricles. They connect the cusps of the tricuspid and bicuspid valves to papillary muscles and regulate the movements of tricuspid and bicuspid valves.