caa a22 4500 477095887 CHVBK 20180405111527.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF00187470 doi (NATIONALLICENCE)springer-10.1007/BF00187470 An electron microscopic investigation into the possible source of new muscle fibres in teleost fish [Elektronische Daten] [W. Stoiber, A. Sänger] This study is based on transmission electron microscopic (TEM) investigations of deep (fast, ‘white') teleost fish muscle proliferation in early developmental stages of three European cyprinid species and the rainbow trout. Our fine structural findings provide evidence that early myotomal growth in these animals may utilize different mechanisms that are activated in close succession during early life history. First, initial enlargement of the deep muscle bulk in the embryo seems to be due to hypertrophy of the somite-cell derived stock of muscle fibres. Second, we suggest that deep muscle growth becomes additionally powered by attachment of presumptive myogenic cells that originate from and proliferate within the adjacent mesenchymal tissue lining. Third, mesenchyme-derived muscle cell precursors are thought to enter the myotomes via the myosepta. After migration between the pre-established muscle fibres these cells may function as myosatellite cells, thus at least partly providing the stem cell population for subsequent rapid hyperplastic growth. Finally, there is evidence that presumptive deep muscle satellite cells also proliferate by mitotic division in situ. A similar process of myogenic cell migration and proliferation may foster intermediate fibre differentiation. The model of myogenic cell migration is discussed in view of in vitro and in vivo data on satellite cell migratory power and with respect to temperature-induced and species dependent differences. As for the latter, our results indicate that patterns of muscle differentiation may diverge between a fast growing salmonid species and a moderately growing cyprinid species of similar final size. The model is compatible with the wellestablished idea that teleost muscle growth may rely on different subclasses of myosatellite cells. Springer-Verlag, 1996 Axial muscle nationallicence Mesenchyme nationallicence Myogenic cells nationallicence Fibre neogenesis nationallicence Development nationallicence Stoiber W. Institute of Zoology, University of Salzburg, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria aut Sänger A. Institute of Zoology, University of Salzburg, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria aut Anatomy and Embryology Springer-Verlag 194/6(1996-12-01), 569-579 0340-2061 194:6<569 1996 194 429 https://doi.org/10.1007/BF00187470 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00187470 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stoiber W. Institute of Zoology, University of Salzburg, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria aut NATIONALLICENCE 700 1- Sänger A. Institute of Zoology, University of Salzburg, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria aut NATIONALLICENCE 773 0- Anatomy and Embryology Springer-Verlag 194/6(1996-12-01), 569-579 0340-2061 194:6<569 1996 194 429 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer