Figure 55-1 shows the functional areas of the cerebral cortex. Anterior to the central cortical sulcus, occupying approximately the posterior one third of the frontal lobes, is the motor cortex. Posterior to the central sulcus is the somatosensory cortex (an area discussed in detail in earlier chapters), which feeds the motor cortex many of the signals that initiate motor activities.
The motor cortex itself is divided into three subareas, each of which has its own topographical representation of muscle groups and specific motor functions: (1) the primary motor cortex, (2) the premotor area, and (3) the supplementary motor area.
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