How is recognition of the moderator band useful?
The moderator band is a consistent structure in the right ventricle. When there is a question which ventricle is which (e.g. L transposition), the moderator band can be a useful structure to help differentiate.
What is the function of the moderator band?
It is part of the electrical conduction pathway of the heart -- the right bundle branch.
The yellow arrow points to the moderator band in the right ventricle.
The second image shows spatial arrangement of the moderator band and anterior tricuspid papillary muscles. The yellow arrow points to the moderator band, stretching across the right ventricular cavity. The smaller brown arrow points to an anterior papillary muscle underneath. The right ventricle wall attachment of the moderator band joins the base of the anterior tricuspid papillary muscle.