Final answer:
The Bundle of His divides into right and left bundle branches in the interventricular septum.
Step-by-step explanation:
The area where the Bundle of His divides into right and left bundle branches is the interventricular septum. Arising from the atrioventricular (AV) node, the Bundle of His proceeds through the interventricular septum before dividing into the bundle branches. The left bundle branch supplies the left ventricle, while the right bundle branch supplies the right ventricle.