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6b somatosensory cortex (frm the specific sensory nuclei of thalamus …

- - - - is located in the postcentral gyrus
        containing the
        Brodmann's area 3,2,1
        
        area 3 neurons
        
        respond to 'light touch
        
        & receive a dense input
        frm the thalamus
        
        area 1 & 2 neurons
        
        respond to deep stimuli such as
        pressure & joint movement s
        
        & receive few thalamic fibers
        
        is supplied by afferents
        frm the opposite side of the body
        
        but from both sides of the face
        
        there is a detailed ( somatotropic)
        loalization of fibers
        frm variuos parts of the body
        in the postcentral gyrus
        
        removal of S2
        
        produces deficits in learning
        -based on tactile discrimination power
        
        but sensory processing in S1
        is not affected
  - - - is located in the
        parietal cortex
        & is mostly buried in the superior wall
        of the sylvian fissure (lateral cerebral sulcus)
        
        unllike S1 it is supplied by
        afferent frm both sides of the body
        
        like S1, it manifest a
        dermatomal (point-to- point)
        sequence of representation
        
        the posterior region
        
        receives afferents frm legs
        
        can be excited by
        
        touch
        
        auditory
        
        visual
        
        & nociceptive stimuli
        
        the anterior parts
        
        receives afferents frm the face
        
        the face area of S2 is immediately
        adjacent to that of S1
        
        1 more item...
        
        respond to touch