Chapman C E, Michalski W J, Séguin J J
Can J Physiol Pharmacol. 1979 Jun;57(6):606-14. doi: 10.1139/y79-093.
The effects of muscle spindle secondary ending activity on the stretch reflex were studied in unanesthetized decerebrate cats. Activation of secondary endings was accomplished by reducing the muscle temperature. This has been shown to cause a sustained asynchronous discharge from secondary endings. Cooling of the medial gastrocnemius or lateral gastrocnemius-soleus muscles caused an increase in the phasic and tonic components of their stretch reflexes. Cooling of the relaxed medial gastrocnemius muscle caused similar increases in the components of the stretch reflex of the synergistic lateral gastrocnemius-soleus muscle and an increase in its monosynaptic reflex. It was concluded that the facilitatory autogenetic and synergistic effects of muscle cooling on the stretch and monosynaptic reflexes were brought about by activity in group II afferents from muscle spindle secondary endings and could not be ascribed to any other type of muscle receptor. These results support the concept of an excitatory role for the secondary endings of the muscle spindle in the stretch reflex of the decerebrate cat.
在未麻醉的去大脑猫中研究了肌梭次级末梢活动对牵张反射的影响。通过降低肌肉温度来实现次级末梢的激活。已表明这会导致次级末梢持续的异步放电。冷却内侧腓肠肌或外侧腓肠肌 - 比目鱼肌会使其牵张反射的相位和紧张成分增加。冷却放松状态下的内侧腓肠肌会使协同的外侧腓肠肌 - 比目鱼肌的牵张反射成分出现类似增加，并使其单突触反射增强。得出的结论是，肌肉冷却对牵张和单突触反射的促进性自身和协同作用是由来自肌梭次级末梢的II类传入纤维的活动引起的，不能归因于任何其他类型的肌肉感受器。这些结果支持了肌梭次级末梢在去大脑猫的牵张反射中起兴奋作用的概念。
