RESUMO
The generation and execution of anticipatory postural adjustments (APAs) depend on the complex distributed neural networks, involving cerebral cortex (including premotor cortex and primary motor area), thalamus, basal ganglia, cerebellum, and divided into stratified mode and parallel mode. The basal ganglia and premotor cortex contribute to code the motor planning of APAs. Supplementary motor area and pedunculopontine nucleus in the brainstem co-regulate the timing of APAs. Primary motor area projects cortical motor fibers to target area during the initiation of APAs. The pontomedullary reticular formation integrates and projects fibers to the spinal cord. The cerebellum is mainly related to the coordinated coupling of muscles during APAs.
RESUMO
Diffusion tensor imaging (DTI) can be used to characterize the orientation of water diffusion, and track white matter fiber bundles. The decrease of fractional anisotropy after stroke indicates impairment of structural integrity of fibers, even Wallerian degeneration if serious; in another hand, the increase of fractional anisotropy relates to the more recovery of motor function. The affected/unaffected ratios of fractional anisotropy are more suitable for predicting motor function recovery after stroke. The changes of corticospinal tract in diffusion tensor tractography can also predict the motor outcome in stroke patients.
RESUMO
Diffusion tensor imaging (DTI) can be used to characterize the orientation of water diffusion, and track white matter fiber bundles. The decrease of fractional anisotropy after stroke indicates impairment of structural integrity of fibers, even Wallerian degeneration if serious; in another hand, the increase of fractional anisotropy relates to the more recovery of motor function. The affected/unaffected ratios of fractional anisotropy are more suitable for predicting motor function recovery after stroke. The changes of corticospinal tract in diffusion tensor tractography can also predict the motor outcome in stroke patients.