  The effect of the finite height of a cylindrical lead salt nanorod on its
electronic structure is studied within the effective mass formalism. It is
demonstrated that for most practical purposes it can be accounted for by
sampling the subband dispersion dependencies of the infinite cylindrical
quantum wire of the same radius at wave numbers $k_z=\pi n_z/H$, where $H$ is
the nanorod height and $n_z$ is an integer. However, under certain conditions
the otherwise degenerate electron energy levels will repel. A detailed account
of these conditions is provided.
