Various hypotheses regarding the homology of the teleostean telencephalon with that of other vertebrates have been proposed to date. However
a firm conclusion on this issue has yet to be drawn. We propose here a new hypothesis with a new eversion model. Our hodological data and the analysis of dorsal telencephalic organization in adult cyprinids suggest that: (1) the area dorsalis pars posterior corresponds to the lateral pallium (2) ventral region of area dorsalis pars lateralis to the medial pallium (3) pars medialis
dorsal region of pars lateralis
pars dorsalis
and pars centralis of the area dorsalis to the dorsal pallium
and (4) nucleus taenia to the ventral pallium. We propose in a three dimensional model that the eversion process occurs not only dorsolaterally but also caudolaterally. We consider that the caudally directed component dominates for ventral zones of the pallium
or the lateral and ventral pallia and the periventricular surface of these zones shift caudally
laterally
and then rostrally in teleosts with pronounced telencephalic eversion. This new model fits well with the putative homology based on hodology and the organization of telencephalic divisions in the adult brain. Copyright c 2007 S. Karger AG.
