  Though models with the radiative neutrino mass generation are
phenomenologically attractive, the complicated relationship between the flavour
structure of additional Yukawa matrices and the neutrino mass matrix sometimes
is a barrier to explore the models. We introduce a simple prescription to
analyze the relation in a class of models with the asymmetric Yukawa structure.
We then apply the treatment to the Zee-Babu model as a concrete example of the
class and discuss the phenomenological consequences of the model. The combined
studies among the neutrino physics, the lepton flavour violation, and the
search for the new particles at the collider experiments provide the anatomy of
the Zee-Babu model.
