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A morphometric study of human fetal sural nerve
Acta Neuropathologica
|January 1, 1986
Summary
Human fetal sural nerve development shows increasing myelinated fiber density and myelin lamellar count. Axon size alone may not solely drive myelination, as unmyelinated axon changes also occur.
Area of Science:
- Neuroscience
- Developmental Biology
- Human Anatomy
Background:
- Sural nerve development is crucial for peripheral nervous system function.
- Understanding myelination and axon development during human fetal growth is essential.
Purpose of the Study:
- To conduct a morphometric analysis of human fetal sural nerves.
- To investigate the developmental timeline of myelinated and unmyelinated axons and myelin sheath formation.
Main Methods:
- Morphometric analysis of sural nerve tissue from human fetuses aged 15 to 36 weeks postovulation.
- Quantification of myelinated and unmyelinated axon densities.
- Measurement of myelin lamellar count and g-ratio.
Main Results:
- Myelinated fiber density increased from 0 at 15-16 weeks to 25,000/mm² by 36 weeks.
- Mean myelin lamellar count tripled, and g-ratio decreased from 0.90 to 0.75.
- Unmyelinated axon density and ratio to myelinated fibers significantly decreased during fetal development.
Conclusions:
- Significant changes in myelinated and unmyelinated axon populations occur during human fetal sural nerve development.
- Myelination is a complex process, potentially influenced by factors beyond just axon diameter.
- The study provides detailed morphometric data on fetal sural nerve maturation.