|In stroke and CP hemiplegics, the possibility of using the undamaged hemisphere, e.g. the ipsilaterally descending corticospinal tract (CST) axons, the bilateral hemispheric pre-motor centers, and bilaterally operating neuronal networks at brainstem and spinal cord levels etc have been proposed recently for inducing compensatory recovery of motor function. In HCP children fMRI studies have shown that the normal competitive process between the crossed and uncrossed CST axons to gain connections with the spinal ventral horn neurons is severely perturbed. In the sitting position the body without trunk support, is unstable and its configuration has to be controlled through muscle activity: when weight is shifted in any plane, the trunk responds with a movement to counteract the change in the center of gravity.
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