Polar structures in late-type galaxies
  A common point of view is that stable polar structures are mainly present in
the E/S0 early-type galaxies lacking dense gas in their host disks. However,
nuclear, as well as external polar rings and disks also exist in the late-type
hosts, including gas-rich dwarf galaxies. Using the 3D spectroscopic
observations of these objects we can derive the rotation properties of the gas
components separately in the main and polar planes. The most detailed picture
of the gas kinematics and mass distribution properties could be obtained from
the combination of optical (H II) and radio (H I) data sets. I briefly review
the results of such studies, including the observations of the direct
interaction between the multi-spin gas components.
