Multiple choice Which among the following structures is NOT associated with a mammalian heart? Intervenous tubercle Chordae tendineae Trabeculae carneae Sulcus terminalis Musculi pectinati Reveal answer Fill a bubble to check yourself D Correct answer Explanation It is a V -shaped groove differentiating the anterior two-thirds of the tongue from the posterior third and containing the circumvallate papillae.