Cheney P D, Preston J B
J Neurophysiol. 1976 Jan;39(1):1-8. doi: 10.1152/jn.1976.39.1.1.
A study was made of the response characteristics of spindle afferents in the baboon soleus muscle. Afferents were isolated from the dorsal roots, their conduction velocities were determined, and their responses were recorded to muscle stretch at rates of 2.5-45 mm/s and amplitudes of 2-10 mm. Spindle afferents could be classified as primary or secondary on the basis of two criteria. The first criterion was conduction velocity. The conduction velocity histogram was bimodal, with peaks at about 45 and 80 m/s and an intermediate region from 55 to 70 m/s. The second criterion was the pattern of adaptation following the peak of ramp stretch. This latter criterion has the advantage of allowing units with intermediate conduction velocities also to be confidently classified as primary or secondary. The velocity and position sensitivities of primate spindle afferents were determined. The mean dynamic index and mean dynamic sensitivity of secondary afferents were about 45% of the corresponding values for primary afferents. On the other hand, the position sensitivities of primary and secondary spindle afferents in the baboon were not significantly different.
对狒狒比目鱼肌梭传入纤维的反应特性进行了一项研究。从背根分离出传入纤维，测定其传导速度，并记录它们对以2.5 - 45毫米/秒的速度和2 - 10毫米的幅度进行的肌肉拉伸的反应。梭传入纤维可根据两个标准分为初级或次级。第一个标准是传导速度。传导速度直方图是双峰的，峰值分别在约45和80米/秒处，中间区域在55至70米/秒之间。第二个标准是斜坡拉伸峰值后的适应模式。后一个标准的优点是，传导速度处于中间值的单位也能被可靠地分类为初级或次级。测定了灵长类动物梭传入纤维的速度和位置敏感性。次级传入纤维的平均动态指数和平均动态敏感性约为初级传入纤维相应值的45%。另一方面，狒狒初级和次级梭传入纤维的位置敏感性没有显著差异。
