The stria of Gennari is a histological feature of
Variations in Coical Structure -The structure of the cerebral coex shows considerable variation from region to region, both in terms of thickness and in the prominence of the various laminae described above. Finer variations form the basis of the subdivisions into Brodmann's areas. Other workers divide the coex into five broad varieties. These are as follows. In the agranular coex the external and internal granular laminae are inconspicuous. This type of coex is seen most typically in the precentral gyrus (area 4) and is, therefore, believed to be typical of 'motor' areas. It is also seen in some other areas. In the granular coex the granular layers are highly developed while the pyramidal and ganglionic layers are poorly developed or absent. In the visual area the external band of Baillarger is prominent and forms a white line that can be seen with the naked eye when the region is freshly cut across. This stria of Gennari gives the name striate coex to the visual coex. Between the two extremes represented by the agranular and granular varieties of coex, three intermediate types are described as follows. Frontal coex Parietal coex and Polar coex. The frontal type is nearest to the agranular coex, the pyramidal cells being prominent, while the polar type is nearest to the granular coex. REF: Inderbir Singh's Textbook of Human Histology, Seventh edition, pg.no., 190.
Motor speech area
Auditory area
Visual area
Prefrontal area
General anatomy