Note that WP states they are ventricular, but MP has classes for atrial ventricular carnea.

The purpose of the trabeculae carneae is most likely to prevent suction that would occur with a flat surfaced membrane and thus impair the heart's ability to pump efficiently. The trabeculae carneae also serve a similar function to papillary muscles in that their contraction pulls on the chordae tendineae, preventing inversion of the mitral (bicuspid) and tricuspid valves, that is, their bulging towards the atrial chambers, which would lead to subsequent leakage of the blood into the atria. So by the action of papillary muscles on the atrioventricular valves, backflow of the blood from the ventricles into the atria is prevented

uberon

cardiac trabecula, columnae carneae, heart trabecula, trabeculae carneae cordis, ventricular trabecula, trabeculae carneae, trabecula of heart

UBERON:0002511

• trabecula carnea cardiac muscle tissue