trabecula carneaGo to external page http://purl.obolibrary.org/obo/UBERON_0002511
the supporting bundles of muscular fibers lining the walls of the ventricles of the heart [ http://www.informatics.jax.org/accession/monikat MP:0004067 ]
Synonyms: ventricle trabecula carnea
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
trabeculae carneae cordis
trabecula of heart