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The parietal operculum is the portion of the parietal lobe on the outside surface of the brain bordering the lateral sulcus, and the extension of this cortex which forms the posterior ceiling of the lateral sulcus. It contains the secondary somatosensory cortex (region S2).
Secondary somatosensory cortexEdit
- Main article: Secondary somatosensory cortex
Areas PV and S2 both map the body surface. Functional neuroimaging in humans has revealed that in areas PV and S2 the face is represented nearest the entrance to the lateral sulcus, and the hands and feet deeper in the fissure, nearer the border with VS. Individual neurons in areas PV and S2 receive input from wide areas of the body surface (they have large "receptive fields"), and respond readily to stimuli such as wiping a sponge over a large area of skin.
Areas S2 in the left and right hemispheres are densely interconnected, and stimulation on one side of the body will activate area S2 in both hemispheres. Area S2 is interconnected with Brodmann area (BA) 1, and densely so with BA 3b, and projects to PV, BA 7b, insular cortex, amygdala and hippocampus. PV connects densely with BA 5 and the premotor cortex.
It was observed, post-mortem, that Albert Einstein was without this section of the brain and that adjacent areas were enlarged.
- ↑ Eickhoff SB, Schleicher A, Zilles K, Amunts K (February 2006). The human parietal operculum. I. Cytoarchitectonic mapping of subdivisions. Cereb. Cortex 16 (2): 254–67.
- ↑ Benarroch, Eduardo E. (2006). Basic neurosciences with clinical applications, 441–2, Edinburgh: Butterworth Heinemann/Elsevier.
- ↑ Witelson SF, Kigar DL, Harvey T (June 1999). The exceptional brain of Albert Einstein. Lancet 353 (9170): 2149–53.
Human brain: forebrain (cerebrum · cerebral cortex · cerebral hemispheres, grey matter) (TA A14.1.09.002–240, 301–320, GA 9.818–826)
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