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Part I: EVOLUTIONARY ORIGINS OF NEURONS AND NERVOUS SYSTEMS
Pages 1-2

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From page 1...
... Thus, the research has moved beyond the relatively simple task of homologizing individual genes and begun to trace the evolution of complex and changing gene networks. An interesting, if as yet barely explored, implication of the idea that gene networks can change function is that the homologous gene networks may function in the development or function of nonhomologous structures (Striedter, 1998)
From page 2...
... Favoring a cladistic approach, Northcutt concludes that the last common ancestor of all bilaterian animals, living ­ 00–700 Mya, probably had a diffusely organized nervous system. 6 Cephalic neural ganglia apparently evolved soon thereafter and were retained in many lineages.


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