EXCITATORY CONNECTIONS BETWEEN SPINAL MOTONEURONS IN THE ADULT RAT  

作　　者：周晖晖 谢益宽 

出　　处：《Chinese Medical Sciences Journal》2000年第1期35-39,共5页中国医学科学杂志（英文版）

基　　金：This study was supported by the grant from ClimbingProgram of Chinese Committee of Science

摘　　要：BZ]Dendro dendritic and dendro somatic projections are common between spinal motoneurons. We attempted to clarify whether there are functional connections through these projections. Methods. Motoneurons were antidromically stimulated by the muscle nerve and recorded intracellularly to examine the direct interaction between them, after the related dorsal roots had been cut. Results. Excitatory connections, demonstrated by depolarizing potentials in response to muscle nerve stimulation, were found between motoneurons innervating the same muscle or synergistic muscles, but never between motoneurons innervating antagonistic muscles. These potentials were finely graded in response to a series of increasing stimuli and resistant to high frequency (50Hz) stimulation. Conclusions.These results indicate that excitatory connections, with certain specificity of spatial and temporal distribution, occur in the spinal motoneurons. It is also suggested that electrical coupling should be involved in these connections and this mechanism should improve the excitability of the motoneurons in the same column.

关 键 词：MOTONEURON dendritic  projection gap  junction excitatory connection 

分 类 号：R338[医药卫生—人体生理学]