supplementary motor cortex

sup·ple·men·tar·y mo·tor cor·tex

a region from which, by electrical stimulation, the musculature of all bodily parts can be activated, as it also can by stimulation of the motor cortex of the precentral gyrus; the region corresponds approximately to the expansion of Brodmann area 6 over the medial surface of the cerebral hemisphere; this area has largely a bilateral representation and is concerned primarily with tonic and postural motor activities.
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