Hörner M, Illert M, Kümmél H
Department of Physiology, University of Kiel, F.R.G.
Neurosci Lett. 1991 Jan 28;122(2):183-6. doi: 10.1016/0304-3940(91)90853-l.
Forelimb alpha-motoneurones were intracellularly recorded in anaesthetized cats and iontophoretically filled with horseradish peroxidase (HRP). All motoneurones to the elbow flexors, elbow extensor and to the extensor carpi radialis muscles displayed in parallel homonymous recurrent inhibitory postsynaptic potentials (RIPSPs) and axon collaterals. Homonymous RIPSPs and axon collaterals were missing in the nuclei to the long digit extensor muscles. Two populations of motoneurones, with and without recurrent axon collaterals, seem to be present in the extensor carpi ulnaris motor nucleus. These results are consistent with the hypothesis that the motoneurones to the extrinsic digit extensors lack a recurrent axonal system. This indicates that the contribution of the recurrent Renshaw systems to motor control may be more complex than hitherto assumed.
在麻醉猫中对前肢α运动神经元进行细胞内记录，并通过离子电泳法用辣根过氧化物酶（HRP）进行填充。所有支配肘屈肌、肘伸肌和桡侧腕伸肌的运动神经元均平行显示出同名性回返抑制性突触后电位（RIPSPs）和轴突侧支。支配长指伸肌的运动神经元核中不存在同名性RIPSPs和轴突侧支。尺侧腕伸肌运动核中似乎存在两类运动神经元，一类有回返轴突侧支，另一类没有。这些结果与以下假设一致，即支配外在指伸肌的运动神经元缺乏回返轴突系统。这表明回返性闰绍细胞系统对运动控制的贡献可能比迄今所认为的更为复杂。
