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Related Experiment Videos

Development of postural muscles and their innervation.

J Ijkema-Paassen1, A Gramsbergen

  • 1Medical Physiology, University Medical Centre Groningen, The Netherlands. j.ijkema-paassen@med.rug.nl

Neural Plasticity
|August 16, 2005
PubMed
Summary

Muscle fibers are specialized for either endurance or force. Postural muscles develop from immature to adult control through changes in innervation and motoneurons.

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Area of Science:

  • Neuroscience
  • Muscle Physiology
  • Developmental Biology

Background:

  • Efficient motor performance relies on postural control.
  • Muscles possess distinct fiber types for endurance (slow) and force (fast).
  • Postural muscles primarily utilize slow, fatigue-resistant fibers, while flexor muscles use fast, fatigable fibers.

Purpose of the Study:

  • To examine developmental changes in muscle fiber properties and innervation.
  • To investigate the maturation of motoneurons in postural muscles.
  • To understand the link between neuromuscular development and motor control transitions.

Main Methods:

  • Analysis of muscle fiber properties in human infants and animal models.
  • Observation of changes in innervation patterns (polyneural to mononeural).
  • Study of developmental alterations in motoneuron dendrite bundles.

Main Results:

  • Muscle fiber properties adapt to functional demands (posture vs. movement).
  • Postural muscles undergo a regression from polyneural to mononeural innervation.
  • Development of motoneuron dendrite bundles correlates with motor control maturation.

Conclusions:

  • Neuromuscular system development continues postnatally, refining muscle control.
  • The transition to adult-like motor and postural control is associated with specific developmental changes in muscle innervation and motoneurons.
  • These findings highlight the plasticity of the neuromuscular system during development.

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