Banks R W
J Anat. 1981 Dec;133(Pt 4):571-91.
The motor innervation of four muscle spindles from the tenuissimus muscle of the cat was demonstrated using reconstructions of 1 micrometer thick, serial transverse sections. Analysis of the results clearly indicates that the bag intrafusal muscle fibre usually does not receive a static fusimotor input via trail innervation. In contrast to the highly selective innervation of bag fibres, almost half the axons supplying bag or chain fibres branched to terminate on both types of fibre. The significance of these results is discussed in relation to previous studies on fusimotor innervation and to their functional implications. The presence of autonomic innervation is a further complication that appears to have led to erroneous conclusions concerning the nature of the trail innervation of chain fibres in a recent study of the distribution of cholinesterase activity in the spindle.
利用对猫薄肌中四个肌梭的1微米厚连续横切片的重建，展示了其运动神经支配情况。对结果的分析清楚地表明，袋状梭内肌纤维通常不会通过尾随神经支配接受静态肌梭运动输入。与袋状纤维的高度选择性神经支配不同，几乎一半供应袋状或链状纤维的轴突会分支并终止于这两种类型的纤维上。结合之前关于肌梭运动神经支配的研究及其功能意义，对这些结果的重要性进行了讨论。自主神经支配的存在是另一个复杂因素，在最近一项关于纺锤体中胆碱酯酶活性分布的研究中，这似乎导致了关于链状纤维尾随神经支配性质的错误结论。
