Does NX use splines to draw elliptical curves?

Does anyone know if NX uses splines to draw ellipses (or elliptical curves)?  I ask because solid bodies I create from extruded or revolved ellipical curves are getting distorted when imported into my FEA code.  Apparently there is a known issue with spline geometry doing this, and the developer was asking if that is what NX uses to construct ellipical curves.  Does anyone know?

Thanks!