part of part of bulbus cordis trunk mesenchyme outflow tract of ventricle conotruncal ridge outflow tract endocardial cushion endocardial ridge EHDAA:1914 VHOG:0001385 aortico-pulmonary spiral ridges EMAPA:17332 One of the pair of spiral mesenchymal swellings in the primordial ventricular outflow tract, that eventually fuse to form the conotruncal septum, dividing the subvalvular outflow tract and contributing to the membranous interventricular septum[MP]. UBERON:0005967 spiral ridge outflow tract cushion bulbar ridge conotruncal cushion RETIRED_EHDAA2:0000194 cardiac mesenchyme