Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/45520
Title: Neuronal differentiation patterns in the optic tectum of the lizard Gallotia galloti
Authors: Báez, Jesús
Monzón-Mayor, Maximina 
Yanes, Carmen 
Romero-Alemán, Maria Del Mar 
Arbelo-Galván, Juan Francisco
Puelles, Luis
Keywords: Rat Superior Colliculus
Clonally Related Cells
Eastern Garter Snake
Immunohistochemical Localization
Chick-Embryo
Thamnophis-Sirtalis
Ganglion-Cells
Golgi
Morphology
Mesencephalon
Issue Date: 2003
Publisher: 0006-8993
Journal: Brain research (Print) 
Abstract: This study examines in detail the sequences of morphological differentiation and deduces mode of migration into specific layers of all types of neurons present in the optic tectum of the lizard Gallotia galloti. It complements previous similar work on tectal histogenesis in the chick. It was found that the neuronal population diversity in the lizard tectum can be reduced by developmental analysis to three neuroblast classes, called Types I, II and III. These classes correspond closely to those present in the developing avian tectum. Neurons belonging to each developmental class were characterized by their initial polarity, mode of translocation into the mantle layer and pattern of sprouting of primary axonal and dendritic processes. Each class produced along time a subset of the cell types distinguished in the mature tectum. Some aspects of sauropsidian tectal histogenesis are also common of other vertebrates, suggesting that fundamental mechanisms of tectal neuronal differentiation are conserved in tetrapods. Analysis of evolutive differences of tectal structure points to changes affecting the layering and perhaps the population size of specific cell types. Whereas tectal cell-type homology can be easily fundamented on embryological evidence and seems to be consistent with hodological and, to some extent, functional homology, the periventricular, central and superficial strata of the tectum are heterogeneous in cellular composition in different species and therefore represent analogous, rather than homologous entities. (C) 2003 Elsevier Science B.V. All rights reserved.
URI: http://hdl.handle.net/10553/45520
ISSN: 0006-8993
DOI: 10.1016/S0006-8993(03)02586-1
Source: Brain Research[ISSN 0006-8993],v. 975, p. 48-65
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