大脑皮层躯体感觉Ⅰ区，相当于Ｂｒｏｄｍａｎｎ的１、２、３ａ、３ｂ区，与中枢神经系统的广泛区域有纤维联系，特别是与丘脑腹侧基底复合体有交互联系纤维投射，参与本体感觉和辨别觉，进行机能定位。近年研究证实ＳⅠ区还在皮层下水平、皮层水平等通过多种路径参与痛觉的下行性调节 The somatosensory area I of the cerebral cortex, equivalent to Brodmann’s 1, 2, 3 a, 3 b areas, has a fiber connection with a wide area of ​​the central nervous system, in particular with the ventral basal complex of the thalamus, with fiber projection involved in proprioception and Discernment, performance positioning. In recent years, studies have confirmed that SⅠ region is also involved in the down regulation of pain sensation through a variety of pathways, such as cortical level and cortical level