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Morphometric analysis of the developing mouse soleus muscle.

M Ontell1, D Hughes, D Bourke

  • 1Department of Neurobiology, Anatomy and Cell Science, University of Pittsburgh School of Medicine, Pennsylvania 15261.

The American Journal of Anatomy
|March 1, 1988
PubMed
Summary
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The soleus muscle in 129 ReJ mice shows significant myotube development during late gestation. Secondary myotube formation peaks between 16 and 18 days in utero, utilizing primary myotubes as scaffolds.

Area of Science:

  • Developmental Biology
  • Muscle Biology
  • Mouse Models

Background:

  • Understanding skeletal muscle development is crucial for regenerative medicine and treating muscle disorders.
  • The soleus muscle, a key postural muscle, undergoes complex organogenesis during embryonic and early postnatal periods.

Purpose of the Study:

  • To quantitatively analyze the organogenesis of the soleus muscle in 129 ReJ mice.
  • To determine age-related changes in muscle morphology and myotube formation during prenatal and early postnatal development.

Main Methods:

  • Quantitative morphometric analysis of serial ultrathin muscle sections.
  • Evaluation of soleus muscles from mice at 14, 16, and 18 days in utero, and 1 and 5 days postpartum.
  • Analysis of muscle girth, length, myotube number, cluster frequency, and myotube dimensions.

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Main Results:

  • Primary myotubes are present by 14 days in utero, with growth and maturation dominating until 16 days.
  • Extensive secondary myotube formation occurs between 16 and 18 days in utero, supporting a scaffolding role for primary myotubes.
  • Myofiber number reaches adult levels at birth, followed by growth and maturation in the first five postnatal days.

Conclusions:

  • The prenatal period, particularly between 16-18 days in utero, is critical for soleus muscle myofiber development in mice.
  • Secondary myotube formation utilizes primary myotubes as a scaffold, and cluster formation/dispersal occurs prenatally.
  • Postnatal development focuses on myofiber growth and maturation after the establishment of the adult myofiber number at birth.