Right Ventricle (III)

C. The crista supraventricularis gives origin to two large muscular bands, the septal band (SB), which courses along the interventricular septum and the parietal band (PB), which is located along the free wall of the right ventricle. The septal band is shown as a prominent muscle trabecula along the upper portion of the interventricular septum. The septal band also gives rise to the medial tricuspid papillary muscle (asterisk) and continues toward the apical region as the moderator band. Together, the septal and moderator bands make up the septomarginal trabecula along which the right bundle branch travels. The moderator band inserts into the base of the anterior papillary muscle.

The ventricular surface of the anterior (also called superior or mural) leaflet of the tricuspid valve is shown.

The next page will show you a right lateral view or the Moderator Band