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The Primary Somatosensory Cortex. Parts of the cerebral cortex in the parietal lobe are involved with processing information related to touch. One such area is the primary somatosensory cortex which is located behind the central sulcus.Neurons in the primary somatosensory are activated when the skin is touched.However, the body is NOT represented in the cortex in proportion to the amount of skin. A map of the human somatosensory cortex was drawn by Dr. Wilder Penfield, a neurosurgeon, in the 1950s.eurons in the primary somatosensory are activated when the skin is touched. However, the body is NOT represented in the cortex in proportion to the amount of skin. A map of the human somatosensory cortex was drawn by Dr. Wilder Penfield, a neurosurgeon, in the 1950s.
In fact, the brain's motor functions have many points in common with its sensory mechanisms, especially those involved in tactile sensations. Thus, the primary motor cortex, in the posterior portion of the frontal lobe, is immediately adjacent to the somatosensory cortex, in the anterior portion of the parietal lobe.he basal ganglia play an indirect role in the motor system. By projecting to the motor cortex, the premotor cortex, and the supplementary motor area simultaneously, they form part of the corto-basal ganglia motor loop, which determines and controls what movements will be performed.