An Elite Cafemedia. (n.d.). Primary Somatosensory Cortex (In Blue). Know Your Brain: Primary Somatosensory Cortex. https://www.neuroscientificallychallenged.com/blog/know-your-brain-primary-somatosensory-cortex. 

University of Rochester

The primary somatosensory cortex (S1) is located in both hemispheres and lies in the postcentral gyrus of the parietal cortex, just behind the central sulcus dividing the parietal lobe from the frontal lobe. Each S1 receives touch information from the opposite side of the body. 
- Topographic Mapping
- Plasticity of the Sensory Cortex

Primary Sensory Cortex

The cells in each primary sensory cortex is arranged according to the plan of the body surface. Each region is a map of the body in which the relative areas devoted to body regions reflect the density of body innervation. Furthermore, parts of the body where we are especially sensitive to touch (like our hands and fingers) send information to a larger area of S1 than do less sensitive body regions (like our shoulder).
The attached picture shows the two homunculi (little men), which represent how we would appear if our body proportions matched cortical representations. As you can see, the hands and face far outweigh other body parts in representation due to innervation. 

Topographic Mapping

Plasticity of the sensory cortex refers to a characteristic of the cortex, that the cortical maps can change with experience. This was demonstrated in an experiment by Merzenich and Jenkins (1993), where they surgically removed the middle finger of the monkey, then found later that the region of cortex that responded to each remaining, adjacent finger expanded.

Plasticity of the Sensory Cortex

Primary Somatosensory Cortex

Since more than half of children with Autism Spectrum Disorder (ASD) display sensory over-responsivity, are there differences in brain response, habituation, and connectivity during exposure to sensory stimuli between children with ASD and sensory over-responsivity, compared to neurotypical children?

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