<prompt> The trabeculae carneae is present inLeft atriumLeft ventricleRight atriumRight ventricle  <response>: In right ventricle,the interior of the inflowing pa shows trabeculae carneae or muscular ridges of 3 types. 1.Ridges or fixed elevations. 2.Bridges 3.Pillars or papillary muscles Ref:B D Chaurasias human anatomy,vol.1. 