title: A new interpretation on the homology of the teleostean telencephalon based on hodology and a new eversion model.
abstract: 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.
authors.affiliation: Department of Anatomy and Neurobiology, Nippon Medical School, Tokyo, Japan. nyama@nms.ac.jp
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Yamamoto
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ishikawa
authors.forename: Masami
authors.initials: M
authors.lastname: Yoshimoto
authors.forename: Hao-Gang
authors.initials: HG
authors.lastname: Xue
authors.forename: Nurmamat
authors.initials: N
authors.lastname: Bahaxar
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sawai
authors.forename: Chun-Ying
authors.initials: CY
authors.lastname: Yang
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ozawa
authors.forename: Hironobu
authors.initials: H
authors.lastname: Ito
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005399:Fishes / Q000033:anatomy & histology* / Q000196:embryology / Q000235:genetics; D008959:Models, Neurological; D013687:Telencephalon / Q000033:anatomy & histology* / Q000166:cytology / Q000196:embryology