The effect of electrical stimulation of the corticospinal tract on motor units of the human biceps brachii
The effect of electrical stimulation of the corticospinal tract on motor units of the human biceps brachii
复制标题
皮质脊髓束电刺激对人体肱二头肌运动单位的影响
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Gandevia
中科院分区：
文献类型：
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作者：
N. Petersen;Janet L. Taylor;S. Gandevia
In healthy human subjects, descending motor pathways including the corticospinal tract were stimulated electrically at the level of the cervicomedullary junction to determine the effects on the discharge of motoneurones innervating the biceps brachii. Post‐stimulus time histograms (PSTHs) were constructed for 15 single motor units following electrical stimulation of the corticospinal tract and for 11 units following electrical stimulation of large diameter afferents at the brachial plexus. Responses were assessed during weak voluntary contraction. Both types of stimulation produced a single peak at short latency in the PSTH (mean 8.5 and 8.7 ms, respectively) and of short duration (< 1.4 ms). In separate studies, we compared the latency of the responses to electrical stimulation of the corticospinal tract in the relaxed muscle with that in the contracting muscle. The latency was the same in the two conditions when the intensity of the stimulation was adjusted so that responses of the same size could be compared. Estimates of the descending conduction velocity and measurements of presumed peripheral conduction time suggest that there is less than 0.5 ms for spinal events (including synaptic delays). We propose that in response to electrical stimulation of the descending tract fibres, biceps motoneurones receive a large excitatory input with minimal dispersion and it presumably contains a dominant monosynaptic component.
背景噪声对大鼠和猫运动神经元对兴奋性电流瞬变反应的影响。
DOI：
10.1113/jphysiol.1996.sp021580
发表时间：
1996
期刊：
The Journal of physiology
影响因子：
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作者：
Poliakov,AV;Powers,RK;Sawczuk,A;Binder,MD
通讯作者：
Binder,MD