Summary
The histological differentiations of myotomes and myosepts in the teleost Brachydanio rerio were studied in relation to function and shape development of the myotomes. The presence of contractile elements, intercellular space, growth by cell proliferation and the collagenous structure of the myosepts were considered as important characteristics.
To a certain extent, the first deformations of the somites could be explained with these characteristics.
It is suggested that firm attachment of the myosept collagen to the notochord sheath and the asymmetrical growth of the myotomes, might be of importance for the development of the oblique orientation of the muscle fibres. The sequence of the differentiation processes is not the same for all muscle cells. Cells next to the notochord synthetize myofilaments before they become polynuclear, while cells elsewhere in the myotome become polynuclear by fusion before they start to synthetize myofilaments. Some aspects of the histological differentiation of the myotomes in B. rerio were compared with myotome development in the chick, Gallus domesticus.
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van Raamsdonk, W., van der Stelt, A., Diegenbach, P.C. et al. Differentiation of the musculature of the teleost Brachydanio rerio . Z. Anat. Entwickl. Gesch. 145, 321–342 (1974). https://doi.org/10.1007/BF00519641
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DOI: https://doi.org/10.1007/BF00519641