内脏运动神经（包括交感神经和副交感神经）从低级中枢到达效应器，一般需要经过两个神经元。第1个神经元称节前神经元，其轴突为节前纤维。第2个神经元称节后神经元，其轴突为节后纤维。
因为交感神经节的谎言接近脊柱，交感神经节前纤维，一般短。
Because sympathetic ganglia lie close to the vertebral column, sympathetic preganglionic fibers are generally short.
在小弯侧切开大鼠胃体前壁以完全切断分布至胃体前壁的迷走神经节前纤维。
After vagotomy of preganglionic fibers in the anterior gastric corpus wall of rats, retrograde-labelling of Horseradish Peroxidase (HRP) was used to detect the regeneration of vagus nerve.
提示靶器官由一群特定的交感节前神经元支配，后者又接受含某种特定神经介质纤维的支配。
It suggests that a target organ may be innervated by a special group of preganglionic neurons, and in turn, they may receive specific neuronal input, characterized by a particular neurotransmitter.
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