Matsunami K, Hamada I
Brain Res. 1981 Jan 5;204(1):29-42. doi: 10.1016/0006-8993(81)90649-1.
The characteristics of the precentral neuron activity related to ipsilateral movements were studied while the monkey was performing finger, wrist and arm movements on either side. Out of 197 task-related neurons, 134 discharged in association with contralateral movements, but not with any one of 3 ipsilateral movements. Fifty neurons discharged with bilateral movements. Thirteen neurons discharged in association with ipsilateral movements (ipsi-neurons). Ten were recorded from the trunk or shoulder area of the motor cortex and were accompanied by contraction of those muscles by intracortical stimulation (ICS). The remaining 3 were related to elbow or wrist, but no ipsi-neurons were related to finger muscle contractions. In ipsilateral task performance, 7 ipsi-neurons discharged in association with finger and/or wrist movements in addition to arm movement. Five others were associated with arm movement. The last one discharged with wrist movement. Most of the units showed similar response to contralateral movement. Ipsi-neurons were classified into two groups. One group was recorded around the sulcus precentralis superior, had the lower threshold current and was mostly associated with finger, wrist and arm movements. The other was recorded in the rostral motor cortex, and had the higher threshold current and was related to arm movement. Among 185 neurons to which pyramidal tract stimulation was delivered, 2 out of the 80 PTNs and 11 out of the 105 non-PTNs were ipsi-neurons. EMGs were recorded from various muscles involved in the forelimb movements. Arm and finger muscles showed no activity when the monkey used the ipsilateral hand, while most of the shoulder and trunk muscles showed tonic or moderate transient changes in the activity during the ipsilateral tasks. The ipsi-neuron activity was discussed in consideration with EMGs.
在猴子进行双侧手指、手腕和手臂运动时，研究了与同侧运动相关的中央前神经元活动的特征。在197个与任务相关的神经元中，134个与对侧运动相关放电，但与3种同侧运动中的任何一种均无关。50个神经元在双侧运动时放电。13个神经元与同侧运动相关放电（同侧神经元）。其中10个记录于运动皮层的躯干或肩部区域，经皮层内刺激（ICS）可伴有这些肌肉的收缩。其余3个与肘部或手腕相关，但没有同侧神经元与手指肌肉收缩相关。在同侧任务执行过程中，7个同侧神经元除了与手臂运动相关放电外，还与手指和/或手腕运动相关放电。另外5个与手臂运动相关。最后1个与手腕运动相关放电。大多数单位对侧运动表现出相似的反应。同侧神经元分为两组。一组记录于中央前沟上方周围，阈值电流较低，主要与手指、手腕和手臂运动相关。另一组记录于额叶运动皮层，阈值电流较高，与手臂运动相关。在接受锥体束刺激的185个神经元中，80个锥体束神经元中有2个，105个非锥体束神经元中有11个是同侧神经元。记录了参与前肢运动的各种肌肉的肌电图。当猴子使用同侧手时，手臂和手指肌肉无活动，而大多数肩部和躯干肌肉在同侧任务期间活动出现强直或中度短暂变化。结合肌电图对同侧神经元活动进行了讨论。
