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外文期刊>Bulletin de la Societe Zoologique de France
>LIENS PHYLOGENETIQUES DEGAGES ENTRE - TENRECINES, INSECTIVORES, PROSIMIENS, SIMIENS NON-HUMANOIEDES, HOMME - ET CHIROPTERES (MEGA- OU MICRO-), AU MOYEN D'ANALYSES MULTIVARIEES DU VOLUME DES ETAGES ENCEPHALIQUES ET DE QUELQUES MACRO-STRUCTURES TELENCEPHAL
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LIENS PHYLOGENETIQUES DEGAGES ENTRE - TENRECINES, INSECTIVORES, PROSIMIENS, SIMIENS NON-HUMANOIEDES, HOMME - ET CHIROPTERES (MEGA- OU MICRO-), AU MOYEN D'ANALYSES MULTIVARIEES DU VOLUME DES ETAGES ENCEPHALIQUES ET DE QUELQUES MACRO-STRUCTURES TELENCEPHAL
The evolution of the brain in mammals (Tenrecinae, Insectivoia, Chiroptera, Prosimii, Simiiformes non-human being, Man) may be understood according to the volumes of its 5 main parts [telencephalon, diencephalon mesencephalon, metencephalon (=cerebellum), myelencephalon (=medulla oblongata)] or of various intratelencephalic structures (Amygdala, Hyppocampus, Main olfactory bulb, Neocortex, Paleocortex, Schizocortex, Septum, Striatum). Multidimensional analysis of data can be accomplished through hyperspaces mode-lisations, such as Minimum spanning tree (MST : fig. 1), Ascending Hierarchic Classification (AHC : fig. 2) and Correspondence factor analysis (CFA : fig. 3-6). A general survey of the results shows that the phyiogeny from Tenrecinae to Man can be read from the progressive volumetric evolution of the main brain parts (fig. 1, 4) or intratelencephalic parts (fig. 6). The position of Chiroptera is somewhat special, with a break between Microchiroptera and Megachiroptera (fig. 2, 3, 5). While the general evolution of the main brain parts retains the rhombencephalon as a characteristic of Tenrecinae, Insectivora and Microchiroptera, the procencephalon and midbrain define Megachiroptera, Prosimii, non-human Simiiformes and Man (fig. 4). Bats follow two tendencies : Megachiroptera are linked with the general telencephalisation process leading towards Man, whereas Microchiropterans show evidence of specialisation for flight in their meten-cephalisation. These opposite tendencies are rooted in Insectivores (fig. 5). The general intratelencephalic evolution clearly shows (fig. 6) that negative hetero-chrony of the Main olfactory bulb constitutes a driving force in evolution towards Man. This fact is associated with evolutive attempts of corticalization : paleocortex (Tenrecinae), Schizocortex (Bats) and dominant neocortex (Primates).
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