轴膜:轴突表面的胞膜,起始段厚,易兴奋 产生N冲动,沿轴膜向终末传递 nucleus of node of Ranvier Schwann cel (neurofibril nod (neurolemmocyte) Motor Neuron axon effector -3 (muscle) 1616 轴膜：轴突表面的胞膜，起始段厚，易兴奋 产生N冲动， 沿轴膜向终末传递