Аннотация:Rotation curves of the Galaxy, M 31, and M 81 have a deep minimum at a radius of 1-4 kpc. It is demonstrated that this minimum can be dynamically explained if the stellar disks of these galaxies have no representatives in the central region. Such a ring-like distribution of matter in stellar disks is suggested by the similarity observed in the distribution of extreme Population I objects if it is assumed that a stellar disk was formed from a gaseous disk which always had a ringlike structure. The presence of central holes in the disks of spiral galaxies suggests that during the initial collapse phase almost all protogalactic gas with a low angular momentum was consumed to form the spheroidal component. No low-momentum gas was left over to form the stars of the central regions of the disks.