Anterior limb of septomarginal trabecula

The anterior limb of the septomarginal trabecula is the muscular band in the right ventricle that extends from the interventricular septum toward the anterior papillary muscle, forming part of the septomarginal trabeculation (also known as the septal band or moderator band complex) and contributing to the structural support of the tricuspid valve apparatus and right ventricular architecture.

This structure is anatomically distinct from the moderator band itself, which is a prominent trabeculation that often contains the right bundle branch of the cardiac conduction system and connects the septal band to the anterior papillary muscle. The anterior limb specifically refers to the portion of the septomarginal trabecula that projects anteriorly within the right ventricle, helping to define the boundaries of the right ventricular inflow and outflow tracts.