单个运动单位的收缩反映在同名α运动神经元的膜电位变化中。

Contractions of single motor units are reflected in membrane potential changes of homonymous alpha-motoneurons.

作者信息

Koehler W, Hamm T M, Enoka R M, Stuart D G, Windhorst U

出版信息

Brain Res. 1984 Apr 2;296(2):379-84. doi: 10.1016/0006-8993(84)90078-7.

Abstract

In anesthetized cats 3 medial gastrocnemius (MG) motor units (MUs) were electrically activated with independent pseudorandom patterns at physiological mean rates. Recordings of isometric MG tension (T) and membrane potential changes (PSPs) in MG alpha-motoneurons (MNs) were averaged with respect to each stimulus train. The resulting T and PSP trajectories displayed the responses of each MN to the 3 average MU twitches. These responses could vary from no response to a sequence of depolarizing and hyperpolarizing waves in a PSP trajectory. The results are consistent with the known behavior of muscle stretch receptors to muscle and MU twitches and the receptors' connections to homonymous MNs.

摘要

在麻醉的猫身上，3个腓肠肌内侧（MG）运动单位（MUs）以生理平均频率通过独立的伪随机模式进行电激活。相对于每个刺激序列，对等长MG张力（T）和MGα运动神经元（MNs）的膜电位变化（PSP）进行记录并求平均值。由此得到的T和PSP轨迹显示了每个MN对3次平均MU抽搐的反应。这些反应可能从无反应到PSP轨迹中一系列去极化和超极化波不等。这些结果与肌肉牵张感受器对肌肉和MU抽搐的已知行为以及感受器与同名MNs的连接是一致的。