2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6141I review some recent results on the inner properties of disk galaxies, and highlight some issues that require either observational or theoretical clarification and that are important for constructing a consistent picture of the formation of the local disk galaxy population.Invited review to appear in "Carnegie Observatory Astrophysics Series, vol 1: Co-evolution of black holes and galaxies", ed. L.C. Ho (Cambridge, Cambridge University Press)Astrophysicstext