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Related Experiment Videos

Neonatal muscle: an electron microscopic study.

M Ontell

    The Anatomical Record
    |December 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Identifying cells within neonatal rat muscle clusters is complex. Spaced serial sections reveal that cell location and morphology alone are insufficient to classify all cells, including true myosatellite cells.

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    Area of Science:

    • Muscle Biology
    • Cellular Ultrastructure
    • Developmental Anatomy

    Background:

    • Neonatal skeletal muscles contain cellular clusters within a shared basement membrane.
    • Distinguishing between developing muscle cells and other cell types in these clusters is challenging.
    • Myosatellite cells are crucial for muscle regeneration but require accurate identification.

    Purpose of the Study:

    • To investigate the classification criteria for cells within neonatal rat muscle fiber clusters.
    • To determine if morphology and location are sufficient to identify true myosatellite cells.
    • To differentiate various cell types ensheathed by the basement membrane of muscle fibers.

    Main Methods:

    • Electron microscopy utilizing spaced serial sections.

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  • Analysis of the extensor digitorum longus muscle from 2-day-old rats.
  • Comparative morphological assessment of cellular nuclei, cytoplasmic ratio, and myofilament presence.

    • Main Results:

    • Immature muscle clusters contained primary fibers, satellite fibers, myotubes, and myosatellite cells.
    • Single sections could not reliably distinguish early myotubes from myosatellite cells.
    • Spaced serial sections showed myosatellite cells possess heterochromatic nuclei and high nuclear/cytoplasmic ratios.
    • Other cell types, including mast cells and fibroblasts, were also found within the clusters' basement membrane.

    Conclusions:

    • Cellular location and single-section morphology are inadequate for classifying all cells within neonatal muscle clusters.
    • Accurate identification of myosatellite cells requires detailed analysis, including nuclear characteristics and cytoplasmic features.
    • Neonatal muscle clusters are heterogeneous, containing diverse cell types beyond the muscle lineage.