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The primary somatosensory cortex was initially defined from surface stimulation studies of Wilder Penfield, and parallel surface potential studies of Bard, Woolsey, and Marshall. Although initially defined to be roughly the same as Brodmann areas3, 1, and 2, more recent work by Kaas has suggested that for homogeny with other sensory fields only area 3 should be referred to as "primary somatosensory cortex", as it receives the bulk of the thalamocortical projections from the sensory input fields.
Postcentral gyrus of the human brain
Brodmann areas 3, 1, and 2 of human brain. Brodmann area 3 is in red, area 1 in green, and area 2 in yellow.
Postcentral gyrus (animation)
Lateral surface of left cerebral hemisphere, viewed from the side.
Primary cortices, including primary somatosensory cortex (labeled in purple)
Postcentral gyrus, showed on the right hemisphere.
Postcentral gyrus highlighted in green on coronal T1 MRI images
Postcentral gyrus highlighted in green on sagittal T1 MRI images
Postcentral gyrus highlighted in green on transversal T1 MRI images
