The planning of movement by the cerebral cortex. It is a region of the frontal lobe consisting of area 4 (often referred to as primary motor cortex or m1) and area 6 (see fig. There is speculation that area 6 might be specialized for skilled voluntary movement. It was later shown that electrical stimulation of area 6 could evoke complex movements of either side of the body. Wilder penfield found two somatotopically organized motor maps in area 6: one in a lateral region called the premotor area (pma) innervate proximal motor units, one in a medial region called the supplementary motor area (sma) The contributions of posterior parietal and prefrontal cortex. A mental body image seems to be generated by somatosensory, proprioceptive, and visual inputs to the posterior parietal cortex. Two areas of interest in the posterior parietal cortex are: Area 5 target of inputs from the primary somatosensory cortical areas 3, 1, and 2.