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The rostrocaudal gradient for somatosensory perception in the human postcentral gyrus
| The first 150 words of the full text of this article appear below. |
Anatomical organisation of the primate postcentral gyrus has
been described in terms of several different
cytoarchitectures.1 2 Powell and Mountcastle stated that
the area 3 was a typical koniocortex with granular cells, whereas in
areas 1 and 2 the morphological characteristics changed gradually to
the homotypical parietal association cortex in the monkey
Macaca mulatta.1 Iwamura
et al reported the physiological
correlates on the anatomical rostrocaudal axis in
monkeys.2 The ratio of skin neurons to total neurons was
the largest in area 3b and decreased gradually toward the caudal part
of the postcentral gyrus.2 Specific types of stimulation such as rubbing of the skin in certain directions were effective in
activating some of the caudal part of the postcentral gyrus. The
anatomical and physiological data in the primate lead to the reasonabe
hypothesis that there is a rostrocaudal functional gradient within the
postcentral gyrus. This notion may explain why a lesion in the
postcentral
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