trabeculae carneae (of right and left ventricles)

tra·bec·u·lae car·ne·ae (of right and left ven·tri·cles)

(tră-bek'yū-lē kahr'nē-ē rīt left ven'tri-kĕlz)
Muscular bundles on the lining walls of the ventricles of the heart.