Summary
Structural details of junctional feet in triads of fish muscle are described. These feet have a less dense central core and contact both sarcoplasmic reticulum and T-tubule membranes at tetragonally disposed sites. The distribution of intramembraneous particles differs at the junctional T-membrane, and the junction is asymmetric.
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Franzini-Armstrong, C., Nunzi, G. Junctional feet and particles in the triads of a fast-twitch muscle fibre. J Muscle Res Cell Motil 4, 233–252 (1983). https://doi.org/10.1007/BF00712033
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DOI: https://doi.org/10.1007/BF00712033