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Changed:
< spicuous. Field 3a is similar in its cell and
< fiber pattern to 3, though without barrels
< in layer 1V. The transition from 3a to 40
< is marked by a general reduction in cell
< packing density. The granule cells of layer
< IV become more widely spaced and globular
< in a manner similar to layer IV of the cau-
< dally contiguous temporal region.
to
> spicuous.
" Parietal region (fields 3, 3a, 2 , I , 40). The parietal region in the present parcellation is approximately coextensive with that of Krieg. "
" As de- scribed by Woolsey and Van der Loos ('70) the barrels are not continuous through the medial limb of field 3. The interposed cor- tical sector without barrels corresponding to field 1 of Krieg ('46a,b) and the rostral portion of the adjacent parietal field desig- nated 7 by Krieg are architectonically sim- ilar. Collectively the area probably in- cludes the SmI representation of the trunk and proximal extremities (Woolsey, '67; Welker, '74) and has been joined in a sin- gle field, 1. "
" In field 1 [compared to 3], the cellularity of layer IV and overall fiber density are much less than in the adjacent barrel field caudally. The character of field 1, though distinctly parietal, is transi- tional in certain respects between parietal and occipital cortex. There is narrowing of overall cortical width, particularly at the expense of layers V and VI. Layer I1 becomes more conspicuous, layer IV and the hypocellular sublamina Va less con- spicuous. "