. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . Theaxons of these cells he regardsas association fibres by whichthe effect of the visual impres-sions is communicated to otherparts of the cortex; and themotor fibres which are known tooriginate from the calcarine re-gion and which give rise to move-ments of the eyes, he believes toarise from the large pyramidalcells. These cells and fibreswould thus account for the partic-ular functions of the visual area.§ 39. It has long been knownthat the internal
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . Theaxons of these cells he regardsas association fibres by whichthe effect of the visual impres-sions is communicated to otherparts of the cortex; and themotor fibres which are known tooriginate from the calcarine re-gion and which give rise to move-ments of the eyes, he believes toarise from the large pyramidalcells. These cells and fibreswould thus account for the partic-ular functions of the visual area.§ 39. It has long been knownthat the internal structure of thecortex differs in different parts; but not till quiterecently has the laborious work of examiningsystematically the whole cortex, and mappingout the limits of each variety of its structure, been has now been done, independently, by different observers,with results that are in close agreement; and this work is one * This stripe is visible, on close inspection, in most areas of the cortex, andbears in general the name of Baillarger. Studien iiher die Hirnrinde des Menschen, Heft 1, pp. 62-70 (Leipzig, 1900),. Fig. 112.—Cortex ofthe Motor Area.(Lewis, from Far-riers Functions ofthe Brain.) Fig. 113.—Cortex of theCalcarine Area. (Lew-is, from FerriersFunctions of theBrain.) The splittingof layer 4 into threelayers is characteristicof this area. Thefibre-stripe of Gennaricomes in layer 4b. 270 THE CEREBRAL HEMISPHERES
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