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Oligodendroglial sheath lengths in developing rat ventral funiculus and corpus callosum
1Department of Cell Biology, Faculty of Health Sciences, University of Linköping, Sweden. carbj@mcb.liu.se
Neuroscience Letters
|September 27, 1996
Summary
Newly formed oligodendroglial sheaths in developing rat brains are initially very short, measuring under 10 microns. These myelin sheaths actively elongate before and during compaction, with significant portions of axons remaining unmyelated in early development.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Oligodendroglial myelination is crucial for central nervous system function.
- The developmental process and initial dimensions of myelin sheaths are not fully understood.
Purpose of the Study:
- To investigate the initial lengths of uncompacted and partly compacted oligodendroglial sheaths.
- To analyze the relationship between sheath length and axon myelination during development.
Main Methods:
- Serial section electron microscopy was used to examine oligodendroglial sheaths.
- Measurements were taken in the developing rat spinal cord (SC) and corpus callosum (CC) at specific developmental ages.
Main Results:
- Newly formed uncompacted sheaths are short (average 21 µm in SC, 33 µm in CC), with many <10 µm.
- Partly compacted sheaths are longer (average 102 µm in SC, 69 µm in CC).
- A significant portion of axon length remains unmyelinated in early stages (approx. 2/3 unensheathed).
Conclusions:
- Oligodendroglial sheaths begin as very short structures.
- Active elongation of sheaths occurs before and during the compaction process.
- The data suggest that some early sheaths may be eliminated to accommodate proper myelination.