Vuco J, Anastasijević R
Institute for Medical Research, Beograd, Yugoslavia.
Scand J Rehabil Med Suppl. 1988;17:133-8.
Apart from the direct influences of muscle spindle sensory endings on skeletomotor neurones a great deal of their reflex drive is provided indirectly via the gamma-loop. Coactivity of skeletomotor and fusimotor neurones provides, on that occasion, for the servoassistance of muscular movement. Fusimotor neurones modulate their discharge rate in parallel with that of the skeletomotor neurons during reflex muscle contraction in decerebrated cats. These modulations take part during the rising phase of the reflex muscle tension as well as during the maintained reflex muscle contraction when small tension oscillations are present in a muscle. Fusimotor firing does not provide the main stimulus for the contractile activity of the muscle in the decerebrated cats but serves to reflect or to reproduce (within the spindle) the extent and the time course of tension changes in a muscle throughout the whole course of its reflex contraction.
除了肌梭感觉末梢对骨骼运动神经元的直接影响外，它们的大量反射驱动是通过γ环路间接提供的。在这种情况下，骨骼运动神经元和肌梭运动神经元的共同活动为肌肉运动提供伺服辅助。在去大脑猫的反射性肌肉收缩过程中，肌梭运动神经元与骨骼运动神经元平行调节其放电率。这些调节发生在反射性肌肉张力的上升阶段以及肌肉存在小张力振荡时的持续性反射性肌肉收缩过程中。在去大脑猫中，肌梭运动神经元的放电并不是肌肉收缩活动的主要刺激因素，而是用于反映或再现（在肌梭内）肌肉在整个反射收缩过程中张力变化的程度和时间进程。
