. A treatise on nervous and mental diseases, for students and practitioners of medicine. he pos-terior portion tb(; sensory fibres; indeed, it may be borne in mind asan invarial)le rule in tracinir the course of a nerve tract in the brain 38 INTRODUCTORY, and cord that the motor fibres lie always anteriorly, or toward theabdomen, or ventrad, as is technically said, whilst the sensory fibresalways lie posteriorly, toward the back, or dorsad. Some of thefibres coming from the cortex pass straight through to lower levels,whilst others terminate in these basal ganglia, and others still origi-nate
. A treatise on nervous and mental diseases, for students and practitioners of medicine. he pos-terior portion tb(; sensory fibres; indeed, it may be borne in mind asan invarial)le rule in tracinir the course of a nerve tract in the brain 38 INTRODUCTORY, and cord that the motor fibres lie always anteriorly, or toward theabdomen, or ventrad, as is technically said, whilst the sensory fibresalways lie posteriorly, toward the back, or dorsad. Some of thefibres coming from the cortex pass straight through to lower levels,whilst others terminate in these basal ganglia, and others still origi-nate in them and pass to the periphery or to other masses of graymatter. A moments thought will convince anyone that this is onlywhat should be expected, because, unless the basal ganglia are toremain isolated, they must be connected with the cortex, with theperiphery, and with other masses of gray matter. In that portion ofthe internal capsule lying anteriorly to the knee, or c/eoiUy are to be Fig. 20, ,»■ FRONTAL F. ,-PB»tCENTRAL ,SYLVIU5 -lOTEMPORAL r21^ TEMPORftLF:. Convolutions of the vertex, on the right; on the left, the basal ganglia, the internalcapsule, the centrum ovale, and the cuneus. found the fibres coming from the frontal convolutions, whilst justabout the knee are to be found the fibres supplying the facialmuscles, just behind these the fibres supplying the tongue, justbehind these again the motor fibres going to the extremities, and stillagain just behind these the sensory fibres. Entering the most poste-rior portion of the internal capsule is to be seen the so-called opticradiation, containing the fibres that come from the occipital lobe andenter the internal capsule, and then curve sharply to the right inorder to pass to the quadrigeminal and geniculate bodies, whichwe shall presently describe. Fig 52 will show that the terminalbranches of the Sylvian artery supplying the internal capsule supplythese different regions, and that the arteries of
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