Mushahwar V K, Horch K W
Department of Bioengineering, University of Utah, Salt Lake City 84112, USA.
IEEE Trans Rehabil Eng. 2000 Mar;8(1):11-21. doi: 10.1109/86.830944.
Selective activation of muscle groups in the feline hindlimb by electrical stimulation of the ventral lumbo-sacral spinal cord was investigated. Spinal cord segments L5 to S1 were mapped using a penetrating tungsten needle electrode. Locations that produced isolated contraction of quadriceps, tibialis anterior or triceps surae/plantaris muscles when stimulated with a current of 40 microA or less, and in which spread of activity to other muscles was not detected after increasing the stimulus to at least twice the threshold level, were defined as belonging to the target muscle's "activation pool." The quadriceps activation pool was found to extend from the beginning of L5 to the middle of L6. The tibialis anterior activation pool extended from the beginning of L6 to the middle of L7, and the triceps surae/plantaris activation pool extended from the caudal end of L6 to the beginning of S1. The three activation pools were located in Rexed motor lamina IX and their spatial organization was found to correspond well with that of the anatomically defined motor pools innervating the same muscles. The spatial and functional segregation of motor pools manifested at the spinal cord level can have direct applications in the areas of functional electrical stimulation and motor control.
研究了通过电刺激猫腰骶部腹侧脊髓对后肢肌肉群的选择性激活。使用穿透性钨针电极对脊髓L5至S1节段进行映射。当用40微安或更小的电流刺激时，产生股四头肌、胫前肌或腓肠三头肌/跖肌孤立收缩，且在将刺激增加到至少阈值水平的两倍后未检测到活动扩散到其他肌肉的位置，被定义为属于目标肌肉的“激活池”。发现股四头肌激活池从L5开始延伸至L6中部。胫前肌激活池从L6开始延伸至L7中部，腓肠三头肌/跖肌激活池从L6尾端延伸至S1起始处。这三个激活池位于Rexed运动板层IX，并且发现它们的空间组织与支配相同肌肉的解剖学定义运动池的空间组织非常吻合。运动池在脊髓水平表现出的空间和功能分离可直接应用于功能性电刺激和运动控制领域。
