纤维鞘的背侧纵柱和腹侧纵柱分别向内伸出一个嵴。
The ridges of the dorsal and ventral longitudinal columns extend inward respectively.
结果表明，放电单元采用大电极间距可获得正柱区放电，正柱区的形成是正离子在阴极鞘层区不断积累将电位抬高所致。
The results show that the long electrode gap leads to the positive column which is caused by the climbing voltage on the cathode surface due to the accumulation of positive ions.
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