Cytoarchitectonics and neuronal organization of the sturgeon telencephalon
Identifieur interne : 001787 ( Main/Merge ); précédent : 001786; suivant : 001788Cytoarchitectonics and neuronal organization of the sturgeon telencephalon
Auteurs : D. K. Obukhov [Russie]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 1999-09.
Abstract
Anatomy, cytoarchitecture and neuronal composition of the i everted‐type telencephalon of various sturgeon species; (Acipenser baeri Br., Acipenser stellatus Pall., Acipenser nudiventris Lov., Acipenser ruthenus L., Acipenser gueldenstaedtii Br., Huso huso L.) were studied by classical histological methods and by TV‐imaging. Hemisphere cytoarchitecture was significantly variable across species and genus, while neurone composition proved to be rather conservative. Neurones were mainly of the undifferentiated, isodendritic type. The question of homology of structures between everted and inverted vertebrate telencephala is discussed, and our observations lead us to hypothesise that evolution of the unusual Actinopterygian (and acipenserid) telencephalon has been limited and is, in fact, an evolutionary “dead‐end”.
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DOI: 10.1111/j.1439-0426.1999.tb00214.x
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