  Semiclassical analysis of shell structures in realistic nuclear potentials
are presented using periodic-orbit theory. We adopted r^alpha potential model
and examined classical-quantum correspondence using Fourier transformation
technique. Spin-orbit coupling is also taken into account in the model
Hamiltonian. Gross shell structure for a certain combination of surface
diffuseness and spin-orbit parameters are investigated and its relation to
pseudospin symmetry is discussed. Analysis of superdeformed shell structure in
realistic model is also presented.
