On old and new comparative neurological sinners: The evolutionary importance of the membranous parts of the actinopterygian forebrain and their sites of attachment
Identifieur interne : 000570 ( Main/Exploration ); précédent : 000569; suivant : 000571On old and new comparative neurological sinners: The evolutionary importance of the membranous parts of the actinopterygian forebrain and their sites of attachment
Auteurs : Rudolf Nieuwenhuys [Pays-Bas]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 2009-09-10.
English descriptors
Abstract
The forebrain of actinopterygian fishes differs from that of other vertebrates in that it consists of a pair of solid lobes. Lateral ventricles surrounded by nervous tissue are entirely lacking. This peculiar configuration of the actinopterygian forebrain results from an outward bending or eversion of its lateral walls during ontogenesis. Due to this eversion, the telencephalic roof plate is transformed into a wide, membranous structure that surrounds the dorsal and lateral parts of the solid lobes and is attached to their lateral or ventrolateral aspects. Another effect of the eversion is that the ventricular surface of the telencephalic lobes is very extensive, whereas their meningeal surface is small. In many recent publications on the forebrain of actinopterygian fishes, these structures are presented as solid lobes, without any reference to the fact that they are the product of an eversion process, and without any indication concerning the location and extent of their ventricular and meningeal surfaces. It is explained here that, in light of current concepts concerning the histogenesis of the brain, these omissions are intolerable. It is also strongly recommended that the location and extent of these surfaces should always be clearly indicated in brain sections in general, because the simple notion that in the brain of vertebrates the ventricular surface is on the inside and the meningeal surface on the outside has numerous and notable exceptions. J. Comp. Neurol. 513:87–93, 2009. © 2009 Wiley‐Liss, Inc.
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DOI: 10.1002/cne.22106
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