STIMULATION OF A MYELINATED NERVE AXON BY ELECTROMAGNETIC INDUCTION

被引:119
作者
BASSER, PJ
ROTH, BJ
机构
[1] Biomedical Engineering and Instrumentation Program, National Center of Research Resources, National Institutes of Health, Bethesda, 20892, MD, Building 13
关键词
ELECTROMAGNETIC INDUCTION; MAGNETIC STIMULATION; MATHEMATICAL MODEL; PERIPHERAL NERVE; SCALING LAWS; THRESHOLD;
D O I
10.1007/BF02446708
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
A model of electromagnetic stimulation predicts the transmembrane potential distribution along a myelinated nerve axon and the volume of stimulated tissue within a limb. Threshold stimulus strength is shown to be inversely proportional to the square of the axon diameter. It is inversely proportional to pulse duration for short pulses and independent of pulse duration for long ones. These results are also predicted by dimensional analysis. Two dimensionless numbers, S(em), the ratio of the induced transmembrane potential to the axon's threshold potential, and T(c)/T, the ratio of the pulse duration to the membrane time constant, summarise the dependence of threshold stimulus strength on pulse duration and axon diameter.
引用
收藏
页码:261 / 268
页数:8
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