Origin and Evolution of the Vertebrate Telencephalon, with Special Reference to the Mammalian Neocortex

1 Introduction There is little doubt that the vertebrate brain is the most complex structure we know. As with any complex structure, there is the immediate question about its origins. Howcouldsuchacomplexdesigndevelopfromthesimplestmulticellular animals? This problem has pervaded the study of evolutionary biology since its beginnings. Although Darwin (1859, 1871) proposed an impeccable mechanism (...