[An experimental study on conductive spinal cord action potentials evoked by direct stimulation of the spinal cord--pathway and source of conductive action potentials in the spinal cord].
The following experiments were carried out in adult cats to clarify the pathway and origin of the conductive spinal cord action potential evoked by dorsal epidural stimulation. (1) Comparison with the potential by surface stimulation of the spinal cord: Since waveforms, conduction velocity, and the relationships between the stimulation site and the change in threshold level were equal to those of surface stimulation, epidural stimulation and direct surface stimulation apparently induced the potential deriving from the same origin. (2) Recording of single fiber action potential: The mean conduction velocity of the dorsal column fiber was approximately 50 m/sec and that of the dorsolateral funiculus fiber was about 80 m/sec. 15-20% of potential N1 and 80-85% of potentials N2 and N3 were composed by the dorsal column fibers, whereas 80-85% of N1 and 15-20% of N2 and N3 were composed by the dorsolateral funiculus fibers.
Soeda
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S
Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan.
D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D004824:Epidural Space; D005071:Evoked Potentials; D009431:Neural Conduction; D013116:Spinal Cord / Q000502:physiology*