Evolution of motor, IA and cutaneous nerve-fibre conduction velocities in premature and fullterm newborns.
The conduction velocities of motor, IA and non-nociceptive cutaneous sensory fibres have been studied in the ulnar and median nerves of 145 healthy fullterm neonates and in 77 preterm neonates (postconceptional age-range 28 to 42 weeks). The posterior tibial-nerve motor and IA fibres were studied: the sural nerve cutaneous-fibre conduction velocities were measured in fullterm neonates only. At each age the IA fibre conduction velocities were the highest. There was no difference between the conduction velocity increase per week of postconceptional age in motor and cutaneous fibres. Except for the cutaneous-nerve fibres, conduction velocities were higher in the upper than in the lower limbs.
Khater-Boidin
J
J
Laboratoire de Neurophysiologique, Faculté de Médecine, Amiens, France.
Duron
B
B
D004558:Electric Stimulation; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000503:physiopathology*; D008297:Male; D009046:Motor Neurons / Q000502:physiology*; D009412:Nerve Fibers / Q000503:physiopathology; D009468:Neuromuscular Diseases / Q000503:physiopathology*; D009619:Nociceptors / Q000503:physiopathology; D010525:Peripheral Nerves / Q000503:physiopathology*; D012867:Skin / Q000294:innervation*; D009435:Synaptic Transmission