Fine structure of the drum muscles of the piranha (serrasalminae, characidae)

Cell Tissue Res. 1977 Dec 28;185(4):547-55. doi: 10.1007/BF00220658.


The anterior and the posterior drum muscles of the piranha resemble each other in all essential fine structural aspects: myofibrils are slender; sarcomeres are short compared with those of other drum muscles; mitochondria, located in the periphery of the fibers, are numerous and show an irregular internal structure; and the sarcoplasmic reticulum is abundant. Triads appear at the level of the Z lines. The drum muscles have many motor endplates, which, however, lack the characteristic junctional-fold apparatus. No lipid substances could be demonstrated in these muscles. In the posterior drum muscle the fibers depart from their orderly longitudinal arrangement at irregular intervals.

MeSH terms

  • Animals
  • Fishes / anatomy & histology*
  • Glycogen / analysis
  • Lipids / analysis
  • Mitochondria, Muscle
  • Motor Endplate
  • Muscles / analysis
  • Muscles / ultrastructure*
  • Myofibrils
  • Sarcoplasmic Reticulum
  • Voice


  • Lipids
  • Glycogen