2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202199The effective action of a (1+2)-dimensional defect is obtained as an expansion in powers of the thickness.Considering non-straight solutions as the zero order term, the corrections to the Nambu action are found to depend on the curvature scalar and on the gaussian curvature .UNB.FIS.FM-002/92, Marcos@FNAL, 12 pages, LatexGeneral Relativity and Quantum Cosmologytext