Summary
Transverse sections of the sphincter pupillae of the guinea-pig iris show, among about 3000 smooth muscle cells, one or two cells with several features of striated muscle fibres. The myofilaments of these special, “striated” muscle cells have irregular and variable arrangements, but they are readily distinguishable from those of smooth muscle cells. The sarcoplasmic reticulum is conspicuous and is characterized by an electron dense content. “Striated” muscle cells show no nexuses.
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References
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Gabella, G. Striated muscle cells in the guinea-pig iris. Cell Tissue Res. 154, 181–188 (1974). https://doi.org/10.1007/BF00223163
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DOI: https://doi.org/10.1007/BF00223163