Zalkind V I
Neirofiziologiia. 1981;13(3):315-21.
462 receptors of passive muscle spindles from m. triceps in cat were divided into two classes--205 units with spontaneous impulse activity (SIA) and 257 units without it. Three types of SIA have been established. 87% of units exhibited a stable long-lasting discharge, the interspike interval distribution being monomodal and symmetrical. The spikes trains in 8% of units were unstable, interval distribution being bimodal. The remaining 5% of units discharged by sporadic irregular single pulses. The first two types of SIA bear no relation to random processes. The static threshold discharge (STD) of previously silent receptors was also divided into the same three types. With the exception of 26 units which did not respond to the maintained discharge at 10 mm static stretch of the muscle, STD of 70% of units of the remaining 231 ones were related to type 1, while 17% and 13% of units--to types 2 and 3, respectively. The comparison of the SIA and STD characteristics may lead to an assumption that impulse generation in the two classes of receptors has the same mechanism. STD is a trivial response to the experimental external static load, whereas SIA may also be considered as a static response. The latter appears in some spindle receptors due to intrinsic static stretching load which is caused by the extra-intrafusal interaction.
对猫肱三头肌的462个被动肌梭感受器进行了分类——205个单位具有自发冲动活动（SIA），257个单位没有。已确定了三种类型的SIA。87%的单位表现出稳定的持续放电，峰间间隔分布呈单峰且对称。8%的单位的脉冲序列不稳定，间隔分布呈双峰。其余5%的单位以零星不规则的单个脉冲放电。前两种类型的SIA与随机过程无关。先前无活动的感受器的静态阈值放电（STD）也分为相同的三种类型。除了26个单位在肌肉静态拉伸10毫米时对持续放电无反应外，其余231个单位中70%的单位的STD与1型相关，而17%和13%的单位分别与2型和3型相关。对SIA和STD特征的比较可能会得出这样的假设，即两类感受器中的冲动产生具有相同的机制。STD是对实验性外部静态负荷的一种简单反应，而SIA也可被视为一种静态反应。后者出现在一些梭形感受器中是由于肌梭外-肌梭内相互作用引起的内在静态拉伸负荷。
