Sterling P, Gestrin P
Science. 1975 Sep 26;189(4208):1091-3. doi: 10.1126/science.1162358.
During natural movements, the motoneurons innervating a single muscle have different patterns of activity that are correlated with differences in synaptic input. The caudal abducens motoneurons fire phasically in synchronous bursts before rapid posterior eye movements; the rostral abducens motoneurons fire only tonically when the eye is fixed or moving slowly. This physiological difference is not related to motoneuron size. In this respect the abducens motoneurons violate the "size principle" that has been advanced for spinal motoneurons. The difference is probably related to the present finding that the caudal but not the rostral cells receive numerous electrical synapses that are known to have a role in synchronizing phasic activity.
在自然运动过程中，支配单一肌肉的运动神经元具有不同的活动模式，这些模式与突触输入的差异相关。尾侧展神经运动神经元在快速向后眼动之前以同步爆发的形式阶段性放电；当眼睛固定或缓慢移动时，头侧展神经运动神经元仅持续放电。这种生理差异与运动神经元的大小无关。在这方面，展神经运动神经元违背了为脊髓运动神经元提出的“大小原则”。这种差异可能与目前的发现有关，即尾侧而非头侧细胞接受大量电突触，已知这些电突触在同步阶段性活动中起作用。
