abnormal heart tube morphology abnormal conotruncus morphology abnormal bulbus cordis, rostral half morphology 2010-10-05T02:09:42Z MPheno.ontology csmith any structural anomaly of the distal portion of the bulbus cordis that will give rise to the conus cordis, which will give rise to the outflow regions of the ventricles, and the truncus arteriosus which will be divided into proximal ends of the ascending aorta and pulmonary trunk MP:0010583