Abstract
Vertebrates are thought to have had a unimodal origin; that is, they are thought to have arisen only once in time (Romer, 1966). Therefore, all vertebrate nervous systems should exhibit certain features in common which reflect their common genetic inheritance. Indeed, at a certain level of examination this appears to be the case. Thus all vertebrate brains that have been examined reveal the same gross brain regions: prosencephalon, mesencephalon, and rhombencephalon. Furthermore, additional subdivisions such as the telencephalon and optic tectum can readily be identified in all vertebrates. Soon, however, a point is reached where clear-cut divisions are not obvious. For example, the dorsal division of the lateral geniculate nucleus, which is easily identified in many mammals because of its striking pattern of lamination, may or may not be present in other vertebrate classes. Therefore, one task for comparative vertebrate neuroanatomy is to identify and describe which neuronal aggregates and neural circuits are or are not present in various vertebrates. This approach, which will document similarities as well as differences, requires comparison of similar findings not only in other members of a particular class but also in species in other vertebrate classes. In this manner, similarities may reveal basic features of neural organization common to all vertebrate central nervous systems whereas differences may reveal important aspects or trends in the evolution of vertebrate nervous systems.
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© 1980 Plenum Press, New York
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Pritz, M.B. (1980). Parallels in the Organization of Auditory and Visual Systems in Crocodiles. In: Ebbesson, S.O.E. (eds) Comparative Neurology of the Telencephalon. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2988-6_11
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DOI: https://doi.org/10.1007/978-1-4613-2988-6_11
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