Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC H3A 2B4, Canada.
Cereb Cortex. 2022 Aug 22;32(17):3651-3668. doi: 10.1093/cercor/bhab439.
The postcentral sulcus is the posterior boundary of the postcentral gyrus where the somatosensory cortex is represented. In the human brain, the postcentral sulcus is composed of five distinct segments that are related to the somatosensory representation of different parts of the body. Segment 1 of the postcentral sulcus, located near the dorsomedial boundary of each hemisphere, is associated with toe/leg representations, segment 2 with arm/hand representations, segment 3 with blinking, and segments 4 and 5, which are near the lateral fissure and the parietal operculum, with the mouth and tongue representations. The variability in location and spatial extent of these five segments were quantified in 40 magnetic resonance imaging (MRI) anatomical brain scans registered to the stereotaxic space of the Montreal Neurological Institute (MNI space), in the form of volumetric (using MINC Toolkit) and surface (using FreeSurfer) spatial probability maps. These probability maps can be used by researchers and clinicians to improve the localization of the segments of the postcentral sulcus in MRI images of interest and also to improve the interpretation of the location of activation peaks generated in functional neuroimaging studies investigating somatosensory cortex.
中央后沟是中央后回的后界，也是躯体感觉皮层所在的位置。在人类大脑中，中央后沟由五个不同的节段组成，它们与身体不同部位的躯体感觉代表区域有关。中央后沟的第 1 节段位于每个半球的背内侧边界附近，与脚趾/腿部的代表区域有关；第 2 节段与手臂/手部的代表区域有关；第 3 节段与眨眼有关；而第 4 节段和第 5 节段则位于外侧裂和顶骨盖附近，与口腔和舌头的代表区域有关。在 40 个磁共振成像 (MRI) 解剖大脑扫描中，对这些五个节段的位置和空间范围的变异性进行了量化，这些扫描被注册到蒙特利尔神经学研究所 (MNI) 立体空间中，采用了体素 (使用 MINC Toolkit) 和表面 (使用 FreeSurfer) 空间概率图的形式。这些概率图可以供研究人员和临床医生使用，以提高在感兴趣的 MRI 图像中对中央后沟节段的定位，并改善对躯体感觉皮层功能神经影像学研究中激活峰值位置的解释。
