Three-dimensional reconstruction of mushroom body neuropils in the polychaete species <Emphasis Type="Italic">Nereis diversicolor</Emphasis> and <Emphasis Type="Italic">Harmothoe areolata</Emphasis> (Phyllodocida,Annelida) |
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Authors: | C M Heuer R Loesel |
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Institution: | (1) Department of Developmental Biology and Morphology of Animals, Institute for Biology II, RWTH Aachen, 52056 Aachen, Germany |
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Abstract: | Mushroom bodies are prominent brain neuropils present in most arthropod representatives. Similar structures in the brain of
certain polychaete species are possibly homologous to these structures. Using three-dimensional reconstruction techniques,
we investigated the structural composition of the mushroom body neuropils in the polychaete species Nereis diversicolor and Harmothoe areolata. Comparative analysis revealed a common organization of neuropil substructures in both species that closely matches the basic
assembly of arthropod mushroom bodies. Concurring with earlier homology assessments, these neuroarchitectural similarities
provide support for a common origin of mushroom body neuropils in polychaetes and arthropods. Beyond that, differences in
the morphological differentiation of neuropil substructures indicate polychaete mushroom bodies to show a high degree of morphological
variability, thus impeding the quest for a common ground pattern of these brain centers. |
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Keywords: | Immunocytochemistry Confocal laser scanning microscopy Annelid evolution Brain anatomy Neurophylogeny |
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