. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . innergranular layer into two, with a layer of large stellate cells between(see p. 269); and in fibre preparations, by the distinctness of thestripe of Gennari, which can be seen with the naked eye; hencethis area is named also the area striata. The boundaries ofthis area are perfectly sharp; the stripe appears suddenly, and thesubdivision of the granular layer is also very sudden. 272 THE CEREBRAL HEMISPHERES Tl^ere are other instances of sudden trans
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . innergranular layer into two, with a layer of large stellate cells between(see p. 269); and in fibre preparations, by the distinctness of thestripe of Gennari, which can be seen with the naked eye; hencethis area is named also the area striata. The boundaries ofthis area are perfectly sharp; the stripe appears suddenly, and thesubdivision of the granular layer is also very sudden. 272 THE CEREBRAL HEMISPHERES Tl^ere are other instances of sudden transitions between onetype of structure and the adjoining types; but as a rule, thetransitions are less abrupt. The distinctions between neighbour-ing areas are based partly on the fusion or subdivision of layers,and partly on quantitative grounds, such as the thickness of thewhole cortex and of the separate layers, the size and frequencyof the cells, the calibre of the single fibres, and the density of thefibre network. § 41. Some of the areas thus marked out in terms of structureby the accompanying histological maps (Figs. 115 and 116) are. Fig. -The Same, Mesial Surface. (Campbell.) Brodmanns map differs from this ofCampbell in that it subdivides many of the areas into two or more. already familiar in the localization of function. The precentralarea, for example, coincides almost exactly with the motor area asdelimited by Griinbaum and Sherrington; the only difference isthat the excitable area extends a millimetre or two further forwardthan the area of giant pyramids. The area striata coincides withthe visual area as marked out by the termination of the optic radia-tion, and hence is named by Campbell the visuo-sensory area;and there is an area in the temporal lobe corresponding to the end-station of the auditory fibres. This correspondence of differencesof structure with the known differences in function lends force tothe view that the other differences in structure, ove
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