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Human anatomy, including structure and development and practical considerations . rly in the paracentrallobule, this increa.ses to over 5 mm.,whilst over the frontal and occipital polesthe thickness of the cortex is reduced toalmost 2 mm. The entire superficialextent of the cortex of the two hemi-spheres has been estimated to be about ^^2000 sq. cm., of which scarcely one- -^third is exposed surface, the remainder Caicarine fissure being sunken. Frontal section of hemisphere including cortex sur- On examining sections of the fresh rouncllng caicarine fissure; stripe of Gennari (outer stripe. =

Human anatomy, including structure and development and practical considerations . rly in the paracentrallobule, this increa.ses to over 5 mm.,whilst over the frontal and occipital polesthe thickness of the cortex is reduced toalmost 2 mm. The entire superficialextent of the cortex of the two hemi-spheres has been estimated to be about ^^2000 sq. cm., of which scarcely one- -^third is exposed surface, the remainder Caicarine fissure being sunken. Frontal section of hemisphere including cortex sur- On examining sections of the fresh rouncllng caicarine fissure; stripe of Gennari (outer stripe. = Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AWDN75

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7.1 MB (207.9 KB Compressed download)

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1589 x 1572 px | 26.9 x 26.6 cm | 10.6 x 10.5 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . rly in the paracentrallobule, this increa.ses to over 5 mm.,whilst over the frontal and occipital polesthe thickness of the cortex is reduced toalmost 2 mm. The entire superficialextent of the cortex of the two hemi-spheres has been estimated to be about ^^2000 sq. cm., of which scarcely one- -^third is exposed surface, the remainder Caicarine fissure being sunken. Frontal section of hemisphere including cortex sur- On examining sections of the fresh rouncllng caicarine fissure; stripe of Gennari (outer stripe. =• of Baillarger) is here unusually distinct. X 3- brain, the cortex does not appear uniformly tinted, but exhibits, even to the unaided eye, an indistinct divisioninto alternate light and dark layers. From without in these are : (i) a thinperipheral layer of whitish color, the stratum zonaie; (2) a thicker layer ofgrayish hue, the external_g;ray stratum ; (3) a thin lighter band, the outer stripeof Baillarger; and (4) a somewhat broader, yellowish-red zone, the internal gray. 1176 HUMAN ANATOMY stratum—four layers beini; more or less clearly recognizable. In certain localities,as in the jjrecentral convolution, the inner gray lamina is subdiiclecl by anadditional white line, the inmr stripe of Baillargcr. In the vicinity of thecalcarine fissure, particularly in the adjacent part of the cuneus, the outer stripe ofBaillarger. whilst narrow, is unusually distinct and confers, therefore, a character-istic appearance upon the cortex of this region (Fig. 1013). The band in thislocation receixes the name of the stripe of Geunari, or the stripe of Vicq dAzyr.In recognition of the priority of description, Gennaris name is sometimes appliedto the external stripe of Baillarger wherever found. The significance of theselight colored strata will be pointed out in connection with the intimate structureof the cortex, suffice it here to note that the stripes of Baillarger correspond tozone

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