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Developmental and pathological changes at the node and paranode in human sural nerves
1Department of Neuropathology, Medical Faculty of the Rheinisch-Westfälische Technische Hochschule, Aachen, Germany.
Microscopy Research and Technique
|August 1, 1996
Summary
Peripheral nerve development involves changes in axon diameter and myelin sheath. Distinguishing normal growth from artificial or pathological changes is crucial for accurate analysis.
Area of Science:
- Neuroscience
- Cell Biology
- Histology
Background:
- Peripheral nerve nodes and paranodes are complex structures.
- These structures are susceptible to artificial, pathological, and developmental changes.
- Distinguishing these changes is essential for accurate research.
Purpose of the Study:
- To analyze normal developmental changes in peripheral nerve nodes and paranodes.
- To differentiate developmental alterations from artificial and pathological changes.
- To understand the structural adaptations during nerve fiber growth.
Main Methods:
- Analysis of human sural nerves.
- Measurement of nodal, paranodal, and internodal axon diameters.
- Microscopic examination of myelin sheath and axolemma interactions.
Main Results:
- Nodal and paranodal axon diameters reach adult values by 3-5 years of age.
- The ratio between internodal and paranodal axon diameters remains relatively constant (1.8-2.0).
- Paranodal myelin sheath adaptation involves attenuation and separation of terminal myelin loops, forming spines.
Conclusions:
- Normal development involves axonal expansion and myelin sheath thickening.
- Paranodal myelin adapts to axonal growth through complex structural rearrangements.
- Understanding these developmental changes is key to identifying pathological alterations.