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The role of the frontal aslant tract and premotor connections in visually guided hand movements

机译：正面的散发和热球连接在视觉引导的手动运动中的作用

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Functional neuroimaging and brain lesion studies demonstrate that secondary motor areas of the frontal lobe play a crucial role in the cortical control of hand movements. However, no study so far has examined frontal white matter connections of the secondary motor network, namely the frontal aslant tract, connecting the supplementary motor complex and the posterior inferior frontal regions, and the U-shaped dorsal and ventral premotor fibers running through the middle frontal gyrus. The aim of the current study is to explore the involvement of the short frontal lobe connections in reaching and reach-to-grasp movements in 32 right-handed healthy subjects by correlating tractography data based on spherical deconvolution approach with kinematical data. We showed that individual differences in the microstructure of the bilateral frontal aslant tract, bilateral ventral and left dorsal premotor tracts were associated with kinematic features of hand actions. Furthermore, bilateral ventral premotor connections were also involved in the closing grip phase necessary for determining efficient and stable grasping of the target object. This work suggests for the first time that hand kinematics and visuomotor processing are associated with the anatomy of the short frontal lobe connections.
机译：功能性神经影像和脑病变研究表明，正面叶的二级电机区域在手动运动的皮质控制中发挥着至关重要的作用。但是，到目前为止没有研究过次级电机网络的正面白质连接，即前斜散，连接辅助电动机综合体和后较低的前部区域，以及通过中间运行的U形背部和腹侧热纤维正面回归。目前研究的目的是探讨短期叶片连接的参与，通过基于球面碎片卷积方法与运动数据相关的牵引数据来关联左手右手健康受试者在达到和伸缩到掌握运动。我们表明，双侧前散发道，双侧腹侧和左侧热量紊乱的个体差异与手动动作的运动特征有关。此外，双侧腹侧热激活连接也参与了确定目标物体的有效和稳定抓握所需的关闭抓握阶段。这项工作表明，手动运动学和求解器处理首次与短额叶连接的解剖相关联。

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