  Unitary and analytic ten-resonance model of the nucleon electromagnetic
(e.m.) structure with canonical normalizations and QCD (up to the logarithmic
correction) asymptotics is constructed on the four-sheeted Riemann surface,
which provides a superposition of vector-meson pole and continuum contributions
in a very natural way. As a result it describes simultaneously all existing
experimental space-like and time-like data on the proton e.m. form factors
(ff's) and on the neutron e.m. ff's as well. A crucial factor in the latter
achievement is the inclusion of a contribution of the fourth excited state of
the $\rho(770)$ meson with the parameters $m_{\rho''''}=2455\pm53 MeV,
\Gamma_{\rho''''}=728\pm2 MeV$ and
$(f^{(1)}_{\rho''''NN}/f_{\rho''''})=0.0549\pm0.0005$,
$(f^{(2)}_{\rho''''NN}/f_{\rho''''})=-0.0103\pm0.0001$. The pronounced effect
of the two-pion continuum on the isovector spectral functions demonstrating a
strong enhancement of the left wing of the $\rho(770)$-resonance close to
two-pion threshold, which was revealed by H\"ohler and Pietarinen by means of
the nucleon ff unitarity condition more than a quarter of the century ago, is
predicted by the model automatically. The model gives large values of the
$f^{(1,2)}_{\phi NN}$ coupling constants, thus indicating the violation of the
OZI rule. Since in the framework of the considered model isoscalar ff's above
their lowest branch point $t^s_0=9m^2_{\pi}$ are complex functions, the
isoscalar spectral function behaviours are predicted as well.
