LANGMANS Medica EDURORINTA Embryology FOURTEENTH EDITION atria in the heart look the same] or inversions[i.e., the two ventricles in the heart are reversed]are present is called situs ambiguus or heterota)q. These individuals are considered to havelaterality defects that have occurred becauseof a failure to properly establish the L mdash;R axis.Patients with these conditions do not havecomplete situs inversus but appear to be pre mdash;dominantly bilaterally left-sided or ...