首都医科大学学报 ›› 1998, Vol. 19 ›› Issue (4): 305-308.

• 论著 • 上一篇    下一篇

Mauthner细胞脊髓EPSP前电位在腹侧树突上的分布

张英才, 李效义, 童学红, 张淑华, 高娜, 虞棻, 张茂先   

  1. 首都医科大学生理学教研室
  • 收稿日期:1998-05-25 修回日期:1900-01-01 出版日期:1998-10-15 发布日期:1998-10-15

Distribution of the Spinal pre-EPSP on the Ventral Dendrite of the Mauthner Cell

Zhang Yingcai, Li Xiaoyi, Tong Xuehong, Zhang Shuhua, Gao Na, Yu Fen, Zhang Maoxian   

  1. Department of Physiology, Capital University of Medical Sciences
  • Received:1998-05-25 Revised:1900-01-01 Online:1998-10-15 Published:1998-10-15

摘要: 用多点胞内记录方法在鲫鱼Mauthner细胞(M-细胞)胞体和腹侧树突探测了脊髓刺激诱发的脊髓EPSP前电位(简称前电位)和逆向动作电位的分布情况.结果表明,前电位在胞体处幅度最大,沿腹侧树突幅度逐渐降低.其衰减扩布的空间常数约为500μm,明显大于逆向动作电位沿同样方向扩布时的空间常数330μm.提示中介前电位的突触比较集中地排列在胞体附近,沿腹侧树突也有少量散在分布.

关键词: Mauthner细胞, 腹侧树突, 脊髓EPSP前电位, 突触, 空间常数, 鲫鱼

Abstract: Spatial distribution of the spinal pre-EPSP(pre-EPSP)and the antidromic action potential evoked by the stimulation of the spinal cord on the soma and ventral dendrite of the crucian carp Mauthner cell was explored by means of multiple intracellular recording technique. The results showed that the maximum amplitude of the pre-EPSP was recorded at the soma, it declined progressively along the ventral dendrite with a spatial constant of about 500 μm, a value much larger than 330 μm estimated on the basis of measurements of the antidromic action potential spreaded in the same direction as pre-EPSP. It suggested that the synapses mediated the pre-EPSP densely impinge on the regions near the soma, whereas scattered synapses also distribute along the ventral dendrite.

Key words: Mauthner cell, ventral dendrite, spinal pre-EPSP, synapse, spatial constant, crucian carp

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