THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The interventricular septum, also known as the ventricular septum, refers to the triangular wall of cardiac tissue that separates the left and right ventricles (i.e., the lower chambers) of the heart. The entire interventricular septum can be further divided into two parts: a muscular portion and a membranous portion.

Detailed explanation-2: -The bundle of His is an elongated segment connecting the AV Node and the left and right bundle branches of the septal crest. It is approximately 1.8 cm long in an adult heart[4] and is primarily located deep within the dense connective tissue.

Detailed explanation-3: -The right bundle branch travels along the right side of the septum and supplies excitation to the right ventricle. The left bundle branch is really two sets of fibers, one anterior and another posterior. These course down the left side of the septum and supply the left ventricle.

Detailed explanation-4: -The posterior descending artery is responsible for blood supply to the posterior one-third of the interventricular septum. The left anterior descending artery (LAD) supplies the anterior two-thirds of the septum.