Field Homology in the Brain of Vertebrates

In this commentary, we discuss the concept of field homology, particularly as applied to the brain in comparative neuromorphology. We emphasize its roots in the topological properties of the Bauplan notion (organization plan) as well as in the still scarcely understood concept of developmental fields, and we criticize their modernly frequent erred substitution by the search of similarity of characters. We defend the logical causal connection of embryonic homology with adult homology, irrespective of the regulatory aspects of ontogeny.