. A treatise on nervous and mental diseases, for students and practitioners of medicine. er, a middle, and an innerone, seen in Fig. 20. The caudate nucleus and the lenticular nucleuswere regarded by the older anatomists as essentially one structure,and Avere known by the collective name of the corpus between the head of the caudate nucleus anteriorly andinternally, the optic thalamus and the tail of the caudate nucleusposteriorly and internally, and the lenticular nucleus externally, is a ANATOMY, 37 mass of white fibres known as the internal capsule. This internalcapsule con
. A treatise on nervous and mental diseases, for students and practitioners of medicine. er, a middle, and an innerone, seen in Fig. 20. The caudate nucleus and the lenticular nucleuswere regarded by the older anatomists as essentially one structure,and Avere known by the collective name of the corpus between the head of the caudate nucleus anteriorly andinternally, the optic thalamus and the tail of the caudate nucleusposteriorly and internally, and the lenticular nucleus externally, is a ANATOMY, 37 mass of white fibres known as the internal capsule. This internalcapsule contains the nerve fibres coming from the convolutions andconverging at this point to pass to the deeper masses of gray nerve fibres, therefore, which have been spread out over thewide surface of the overarching convolutions of the cortex, are herenarrowed into the constricted strait of the internal capsule. Thisshould be carefully borne in mind, because upon this anatomical factdepend some important points of diagnosis, as it will be evident Fig. 19. tUTEHAL VENTRICLE/ OPTIC. A/i/rf/IIO» C0f4M/i5l/»£ MW,DLB COMMISSURE3-<VBNTRICLE posteriorcommissure CORPUSQUADRlGlhAINM DESCENDINGCORNU CEREBELLUM Drawing showing the basal ganglia of the cerebrum. that a small lesion capable of injuring many fibres which are packedtogether into the narrow compass of the internal capsule would beutterly incapable of injuring the same number of fibres if it attackedthem after they had spread out over the wide area of the the right side of the brain, in Fig. 20, for example, are figured thedifferent convolutions of the vertex of the brain. Let the readercontrast the size of the lesion that would be necessary to affect all thedifferent centres upon these convolutions with the size of the lesionthat could affect the nerve fibres coming from these centres afterthey have converged into the internal capsule, and he will obtain aclear idea of what I am attempting to explain. This
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