  We present a detailed study of the dynamics associated with the ghost sector
of quenched QCD in the Landau gauge, where the relevant dynamical equations are
supplemented with key inputs originating from large-volume lattice simulations.
In particular, we solve the coupled system of Schwinger-Dyson equations that
governs the evolution of the ghost dressing function and the ghost-gluon
vertex, using as input for the gluon propagator lattice data that have been
cured from volume and discretization artifacts. In addition, we explore the
soft gluon limit of the same system, employing recent lattice data for the
three-gluon vertex that enters in one of the diagrams defining the
Schwinger-Dyson equation of the ghost-gluon vertex. The results obtained from
the numerical treatment of these equations are in excellent agreement with
lattice data for the ghost dressing function, once the latter have undergone
the appropriate scale-setting and artifact elimination refinements. Moreover,
the coincidence observed between the ghost-gluon vertex in general kinematics
and in the soft gluon limit reveals an outstanding consistency of physical
concepts and computational schemes.
