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Étude ultrastructurale du "plexus colonial" et recherche de connexions nerveuses interzoidiales chez le bryozoaire chilostome Electra pilosa (Linné) = Ultrastructural study of the network and research of inter-zooidal nervous connections in Electra pilosa , Bryozoa, Chilostoma
Lutaud, G. (1979). Étude ultrastructurale du "plexus colonial" et recherche de connexions nerveuses interzoidiales chez le bryozoaire chilostome Electra pilosa (Linné) = Ultrastructural study of the network and research of inter-zooidal nervous connections in Electra pilosa , Bryozoa, Chilostoma. Cah. Biol. Mar. 20(3): 315-324
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094
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  • Lutaud, G.
Abstract
    The ultrastructural characters of the network in the partitions of Electridae were investigated in Electra pilosa. Electron micrographs confirm that the filament surrounding the basal wall of every zooecium is a chain of elongated cells without sheath or adventitious cells, lying beneath the parietal epithelium. Cellular processes look like single nerve fibres with a clear cytoplasm enclosing sparse strands of granular reticulum, characteristic mitochondria and longitudinal microtubules. These characters are consistent with the presumed nervous nature of the network. The abutting endings of successive cells are united by wide adhesion areas where both desmosomes and extensive narrowings of the intermembrane space which might be gapjunctions are found. The interzooidal bonds establishing the colonial continuity of the nervenet were observed on specimens vitally stained by methylene blue, although they were not found on semi-serial sections of communication chambers. They consist of an intermediary cell across one pore in every poreplate, linking the parietal filaments of adjacent zooids on both sides of their common partitions. The intermediary cells are asymmetrical with a swollen body on one side and a thin process extending on the other side across the pore, and oriented in the general directions of budding and wall morphogenesis.
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