Scott D T, Ferrell W R, Baxendale R H
Institute of Physiology, University of Glasgow.
Exp Physiol. 1994 May;79(3):357-64. doi: 10.1113/expphysiol.1994.sp003770.
Electrical stimulation sufficient to excite group II/III afferent fibres in the posterior articular nerve (PAN) of the cat knee joint facilitated gamma-motoneurone firing in filaments of the lateral gastrocnemius/soleus (LGS) nerve. Repetitive (0.5-2.0 Hz) electrical stimulation of the PAN, produced a short latency increase of gamma-motoneurone firing with a latency ranging from 8 to 35 ms. The shortest of these delays suggests a segmental link between group II knee joint afferents and lateral gastrocnemius/soleus gamma-motoneurones. This facilitation was diminished or abolished if the first stimulus was preceded by a conditioning stimulus which excited the group IV afferents in the PAN. This depression of facilitation was dependent on the interval between the test and conditioning stimuli and the interval which produced the greatest depression was consistent with the effect being due to group IV afferents. Inhibition of the facilitation did not significantly alter the on-going discharge rate of the gamma-motoneurones. This suggests that it was not due to direct inhibition of the motoneurones.
足以激发猫膝关节后关节神经（PAN）中II/III类传入纤维的电刺激，促进了外侧腓肠肌/比目鱼肌（LGS）神经细丝中γ运动神经元的放电。对PAN进行重复（0.5 - 2.0赫兹）电刺激，可使γ运动神经元放电产生短暂延迟增加，延迟时间为8至35毫秒。这些延迟中最短的表明II类膝关节传入纤维与外侧腓肠肌/比目鱼肌γ运动神经元之间存在节段性联系。如果在第一个刺激之前施加一个能激发PAN中IV类传入纤维的条件刺激，这种易化作用就会减弱或消失。这种易化作用的抑制取决于测试刺激和条件刺激之间的间隔，产生最大抑制作用的间隔与IV类传入纤维产生的效应一致。对易化作用的抑制并没有显著改变γ运动神经元的持续放电率。这表明它不是由于对运动神经元的直接抑制所致。
