part_of part of part of develops from contributes to morphology of cardiac neural crest membranous layer interventricular septum interventricular septum membranous part pars membranacea (septi interventricularis) EMAPA:18246 ventricle membranous septum cardiac ventricular membranous septum membranous part of interventricular septum membranous portion of interventricular septum MA:0002939 ventricular membranous septum SCTID:278228007 membranous interventricular septum UBERON:0004666 FMA:7135 The membranous portion of the wall between the two lower chambers of the heart. membranous interventricular septum VHOG:0000927 membranous septum membranous part interventricular septum EHDAA2:0004596 heart layer