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象感觉皮质区域一样,运动皮质也是由一个基本区域(primary area MI)和一些非基本或次要区域(secondary area)所组成。有关人体输助运动区(Supplementary Motor Area,SMA)的功能及准确定位,虽有实验研究的文献报道,但尚存在着分歧,有人通过电刺激臂、手及正电子发射扫描,发现人类具有SMA,并应用空间平分技术(Spatial avera-ging technique)产生立体定向正常化的影像加以解释。但也有人通过对眼、手指及足所施行的运动作业(task)引起区域性脑血流(rCBF)的增加,否定了SMA 的躯体定位(somatotopy),因为rCBF 的增加,大致位于假定与SMA 相符合的相似的皮质部位。
Like the sensory cortex, the motor cortex is also composed of a primary area MI and some non-primary or secondary areas. Although the functional and accurate positioning of the SMA (Supplementary Motor Area) has been reported in the literature, there are still some differences. Some people have found that SMA has SMA , And the use of spatial bisecting technique (Spatial avera-ging technique) to generate stereotactic normalized images to explain. However, some people also increase the regional cerebral blood flow (rCBF) by exercising tasks on the eyes, fingers and feet, negating the somatotopy of the SMA because the increase of the rCBF is roughly located between the hypothesis that SMA Matches similar cortical parts.