Junctional feet and particles in the triads of a fast-twitch muscle fibre

J Muscle Res Cell Motil. 1983 Apr;4(2):233-52. doi: 10.1007/BF00712033.


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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Air Sacs
  • Animals
  • Cell Membrane / ultrastructure
  • Fishes / anatomy & histology*
  • Intracellular Membranes / ultrastructure
  • Microscopy, Electron
  • Models, Biological
  • Muscle Contraction*
  • Muscles / ultrastructure*
  • Myofibrils / ultrastructure
  • Sarcoplasmic Reticulum / ultrastructure*