Comparative Anatomy of the Cardiac Septomarginal Trabecula (Moderator Band)

Abstract

The septomarginal trabecula (trabecula septomarginalis or moderator band) is present in all human hearts and also in the hearts of other primates. It forms the lower limit of the trabecular inflow tract of the right ventricle. It bridges between the lower part of the interventricular septum and the base of the anterior papillary muscle; although it sometimes exhibits some variations of extension. It also conveys the continuation of the right bundle branch of the specialized conducting system of the heart [7-9].