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Related Experiment Videos

Axonal constriction at Ranvier's node increases during development

C Swärd1, C H Berthold, I Nilsson-Remahl

  • 1Department of Anatomy and Cell Biology, Göteborgs University, Sweden.

Neuroscience Letters
|May 12, 1995
PubMed
Summary
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The nodal-to-internodal diameter ratio in cat spinal roots narrows during development, reaching adult levels by 8 weeks. This constriction may regulate axonal transport in myelinated nerve fibers.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Myelinated axons are crucial for nerve impulse transmission.
  • Axon diameter and nodal structure are key factors in neuronal function.
  • Understanding axonal development is vital for neuroscience research.

Purpose of the Study:

  • To investigate the developmental changes in the nodal-to-internodal diameter ratio (dn/d(in)) of large myelinated axons in the cat's L7 ventral spinal root.
  • To correlate these changes with the maturation of the nodal region.
  • To explore the functional implications of nodal constriction on axonal transport.

Main Methods:

  • Light and electron microscopy were employed.
  • Analysis focused on large myelinated axons in the cat's L7 ventral spinal root.

Related Experiment Videos

  • Measurements of nodal and internodal diameters were taken during pre- and postnatal development.

    • Main Results:

    • A significant nodal constriction (dn/d(in) = 0.6) was observed at the onset of myelination, preceding birth.
    • The dn/d(in) ratio progressively decreased over the first 10 postnatal weeks.
    • By 8 weeks of age, the ratio approached the adult value of 0.47.

    Conclusions:

    • The developing nodal region exhibits significant structural changes, including progressive constriction.
    • The constricted nodal axon segments may play a role in regulating axonal transport in mature myelinated nerve fibers.
    • These findings contribute to understanding the maturation and functional specialization of myelinated axons.