Organization of Skeletal Muscle in the Urodele Triturus cristatus: Muscle Fibre Types and Motor Units

Four muscle fibre types are described in the biceps and extensor digitorum communis muscles of the newt forelimb. The histological criteria forming the basis for the distinctions include differential staining with p-phenylenediamine and succinate dehydrogenase histochemistry and electron microscopy....

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Bibliographic Details
Published in:Proceedings of the Royal Society of London. Series B, Biological sciences Biological sciences, 1985-02, Vol.223 (1233), p.495-510
Main Authors: Tonge, D. A., Holder, N., Jesani, P.
Format: Article
Language:English
Subjects:
Action potentials
Aminopyridines - pharmacology
Anatomy
Animals
Biological and medical sciences
Fatigue
Frogs
Fundamental and applied biological sciences. Psychology
Innervation
Isoquinolines - pharmacology
Lipids
Membrane Potentials - drug effects
Microscopy, Electron
Muscle Contraction - drug effects
Muscle fibers
Muscles
Muscles - anatomy & histology
Muscles - physiology
Muscles - ultrastructure
Nerves
Skeletal muscle
Striated muscle. Tendons
Triturus - anatomy & histology
Vertebrates: osteoarticular system, musculoskeletal system
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Summary:Four muscle fibre types are described in the biceps and extensor digitorum communis muscles of the newt forelimb. The histological criteria forming the basis for the distinctions include differential staining with p-phenylenediamine and succinate dehydrogenase histochemistry and electron microscopy. In addition, three distinctive motor unit types are described for the biceps muscle. These are fast units, slow units and intermediate units. The structure of muscle fibre and the physiological characteristics of muscle fibres belonging to each motor unit, have been correlated by using iontophoretic passage of Lucifer yellow into muscle fibres belonging to physiologically characterized motor units and their subsequent histological identification by the succinate dehydrogenase reaction. The three motor unit types correspond to slow muscle fibres, intermediate muscle fibres and two classes of fast muscle fibres.
ISSN:0962-8452
0080-4649
0950-1193
1471-2954
2053-9193
DOI:10.1098/rspb.1985.0015