Objective To study ultrastructural feature of sympathetic nerve of palmar hyperhidrosis and discuss the relation between palmar hyperhidrosis and the expression of nAchR α 7 subunit in thorax sympathetic ganglia. 目的研究手汗症患者胸交感神经的超微结构特点并探讨胸交感神经节乙酰胆碱受体α7亚单位的表达与手汗症的关系。