Cutaneous control of group I pathways from ankle flexors to extensors in man
Cutaneous control of group I pathways from ankle flexors to extensors in man
复制标题
人类从踝关节屈肌到伸肌的 I 组通路的皮肤控制
DOI：
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发表时间：
2004
影响因子：
2
通讯作者：
R. Mazzocchio
中科院分区：
文献类型：
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作者：
Alessandro Rossi;R. Mazzocchio
本文研究了正常人在对照条件下和低强度刺激同侧和对侧足的足底和足背区皮肤传入纤维后，胫前肌对比目鱼肌拮抗运动神经元的相互抑制。同侧皮肤刺激增强了对比目鱼肌运动神经元的相互抑制作用，足底刺激和足背刺激对比目鱼肌运动神经元的相互抑制作用无质的差异。刺激来自对侧足的皮肤传入纤维产生相反的效果，即，从胫骨前肌到比目鱼肌运动神经元的Ia相互抑制的抑制。当刺激足部以外的皮肤区域时，未观察到任何影响。只有当这种抑制接近其最大值时，皮肤刺激对相互抑制的影响才变得明显，因此，它们最强烈地影响其恢复阶段。由于皮肤刺激不修改测试反射时，单独给予，这是可能的，必须有共同的前运动神经元间神经元的会聚。中枢延迟的间接评价表明，从脚的皮肤传入纤维具有oligosynaptic脊髓连接与interneurons属于组I的途径拮抗剂。我们的研究结果提供了额外的证据，比目鱼肌运动神经元的短潜伏期抑制后，一个单一的条件刺激组I传入的胫骨前肌构成了一个真正的例子，在人的双突触Ia相互抑制。
SummaryReciprocal inhibition from the anterior tibial muscle onto antagonist motoneurones of the soleus muscle was studied in normal man under control conditions and after low intensity stimulation of cutaneous afferent fibres from the sole and dorsal region of the ipsilateral and contralateral foot. Ipsilateral cutaneous stimulation increased the reciprocal inhibition to the soleus motoneurones, without qualitative differences between the effect from the sole and that from the dorsal region of the foot. Stimulation of cutaneous afferent fibres from the contralateral foot produced the reverse effect, i.e., depression of the Ia reciprocal inhibition from the tibialis anterior to the soleus motoneurones. No effects could be observed when cutaneous areas other than those of the foot were stimulated. The effects of cutaneous stimulation on the reciprocal inhibition became evident only when this inhibition approached its maximum and, thus, they most strongly influenced its recovery phase. Since cutaneous stimulation does not modify the test reflex when given alone, it is likely that there must be convergence on common premotoneuronal interneurones. Indirect evaluation of central delay suggests that the cutaneous afferent fibres from the foot have oligosynaptic spinal connections with interneurones belonging to the group I pathways to the antagonists. Our findings furnish additional evidence that short-latency inhibition of soleus motoneurones after a single conditioning stimulation of group I afferents from the tibialis anterior muscle constitutes a true example of disynaptic Ia reciprocal inhibition in man.