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[Electrophysiological aspects of peripheral nervous system development]
1Laboratoire de neurophysiologie, URA 1331 CNRS, faculté de médecine, Amiens, France.
Neurophysiologie Clinique = Clinical Neurophysiology
|July 1, 1992
Summary
Peripheral nerve maturation in infants shows that absolute refractory periods are established at birth and vary by fiber type, not conduction velocity. Muscle fiber refractory periods differ between premature and full-term neonates.
Area of Science:
- Neuroscience
- Developmental Biology
- Physiology
Context:
- Peripheral nervous system (PNS) maturation is crucial for infant development.
- Understanding nerve and muscle fiber excitability provides insights into neurological development.
Purpose:
- To investigate the maturation of peripheral nerve and muscle fibers in infants.
- To characterize absolute refractory periods and conduction velocities in different nerve fiber types.
Summary:
- Absolute refractory periods (ARPs) in nerve fibers are established at birth and are characteristic of fiber groups, independent of conduction velocity.
- Most excitable fibers exhibit smaller ARPs than motor fibers. Muscle fiber ARPs are higher in premature neonates compared to full-term neonates and adults.
- Conduction velocities indicate that type IA fibers have the highest velocities, with significant differences between fiber length development and postnatal diameter growth influencing conduction times.
Impact:
- Provides foundational data on normal PNS development in infants.
- Highlights distinct maturation patterns between nerve and muscle fibers.
- Offers insights into potential electrophysiological markers for assessing infant neurological status.