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Ultrastructure of muscle cells in Siboglinum fiordicum (Pogonophora)

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Summary

Two different muscle types are found in the body of Siboglinum fiordicum: body wall muscle and blood vessel muscle. Both are of a myomesothelial type.

The myofibrils of the body wall muscle are non-striated and consist of thick and thin myofilaments. Scattered dense bodies and attachment plaques are described. The sarcoplasmic reticulum forms a three-dimensional network in the myofibrils and only peripheral couplings are observed. The thick filaments are of a paramyosin type and have a diameter ranging from 400–1500 Å.

The blood vessels muscle is non-striated, but sometimes a sarcomere-like organization has been observed. Both thick and thin filaments are present. The thick filaments have a diameter of 250–400 Å and lack transverse striations. Dense bodies and attachment plaques are few. The sparse sarcoplasmic reticulum is restricted to the myofibril periphery where it makes peripheral couplings with sarcolemma. The luminal surface of the vessels is lined by a basal lamina with collagen-like inclusions. No endothelium is found. The body wall muscle and the blood vessel muscle are compared with other muscle types described in invertebrates.

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  1. Cellular Cardiology Research Group Institute of Anatomy, University of Bergen, Norway

    H. Jensen & R. Myklebust

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  1. H. Jensen
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  2. R. Myklebust
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Jensen, H., Myklebust, R. Ultrastructure of muscle cells in Siboglinum fiordicum (Pogonophora). Cell Tissue Res. 163, 185–197 (1975). https://doi.org/10.1007/BF00221726

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  • DOI: https://doi.org/10.1007/BF00221726

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