  The central kpc of barred galaxies exhibits a wealth of morphological
information on different components with clear dynamical consequences. These
include nuclear rings, spirals, bars, and more. We argue that this morphology
is driven by large-scale stellar bars and analyze its consequences for gas
dynamics and the distribution of star-forming regions. Specifically, we focus
on gas flows in nested bar systems and study their origin, as well as the
gravitational decoupling of gaseous nuclear bars with and without gas
self-gravity. We find that the gas response in nested bars differs profoundly
from that in single bars, and that no offset dust lanes form in the nuclear
bars.
