heart ventricle papillary muscle morphology trait Any measurable or observable characteristic related to the shape, structure, color or pattern of the group of myocardial bundles which terminate in the chordae tendineae that attach to the cusps of the atrioventricular valves; each ventricle has an anterior and a posterior papillary muscle; the right ventricle sometimes has a septal papillary muscle. MP:0004058 Trait.ontology VT:0000063 musculus papillaris morphology trait ventricular papillary muscle morphology trait heart ventricle morphology trait heart muscle morphology trait