Motor Organization in Schizencephaly: Outcomes of Transcranial Magnetic Stimulation and Diffusion Tensor Imaging of Motor Tract Projections Correlate with the Different Domains of Hand Function

Figure 6

Schematic description of the interhemispheric competition of motor function in schizencephaly. Assuming that both (a) and (b) have the same degree of motor function invasion by the schizencephalic cleft in the right hemisphere, the activation of the contralateral corticospinal tract in the right hemisphere depends on the size of the concomitant lesion in the left hemisphere. The size of the circle marked “m” in the seesaw picture represents the degree of motor function. In (a), the weight of the motor function was inclined toward the left hemisphere, but in (b), the left and right hemispheres had similar weights of the motor function, and hence, they hardly tilted to one side.

(a)

(b)