Nervous and mental diseases . Fig. 77.—Diagram to show the relative position of the several motor tracts in their course from thecortex to the crus. The section through the convolutions is vertical; that through the internal capsule,1, C, horizontal; that through the crus is again vertical; CN, caudate nucleus ; O, TH, optic thalamus;L2 and L^, the middle and outer parts of the lenticular nucleus ; /, a, I, face, arm, and leg fibers. Thewords in italics indicate the corresponding cortical centers (after Gowers). sentation, the apparent functional difference arising from the specializingof unil
Nervous and mental diseases . Fig. 77.—Diagram to show the relative position of the several motor tracts in their course from thecortex to the crus. The section through the convolutions is vertical; that through the internal capsule,1, C, horizontal; that through the crus is again vertical; CN, caudate nucleus ; O, TH, optic thalamus;L2 and L^, the middle and outer parts of the lenticular nucleus ; /, a, I, face, arm, and leg fibers. Thewords in italics indicate the corresponding cortical centers (after Gowers). sentation, the apparent functional difference arising from the specializingof unilateral motility in the opposite or most intimately related cortex,by practice, habit, and education. \ 186 DISEASES OF THE BRAIN PROPER. From these diagrams we can understand that lesions in the cerebralwhite matter must be close to the cortex or in the internal capsule to. ,NC .NR Fig. 78.—Schematic vertical transverse section of the hemispheres passing through the internalcapsule and representing the sensory pathways. G, Left hemisphere; D, right hemisphere; ce, corpuscallosum; ci, internal capsule; SG, sensory pathway from left side of cord; SD, sensory pathway fromright side of cord. Both sides are brought into intimate relation through the corpus callosum, and thesensory representation is uniformly bilateral (after Brissaud). produce permanent and definite sensory symptoms, as otherwise placedthey do not intercept the pathways to both hemispheres. The symp-toms in subcortical lesions correspond to the function of the relatedcortex, and in capsular lesions to the function of the particular tractsinvolved. The radiations to and from the cortex in the area of latentlesions may be, and often are, involved without giving rise to anysymptoms. The corpus callosum may be diseased to almost any extent withoutpresenting any peculiar symptoms. Bristowe, Shar
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