. A treatise on nervous and mental diseases, for students and practitioners of medicine. ting of the white matter in the centrefringed around with the convolutions. Fig. 18 represents a stilldeeper section of the liemisphere, showing in the middle line thegreat mass of commissural or connecting fibres running across fromone hemisphere to the other, the so-called corpus callosum. Whenthis corpus callosum is lifted (Fig. 19) the ganglia of the base, or thehanal rjanglia, are seen lying in the ventricles, the third ventricle inthe centre and the lateral ventricles one on each side. These basal 36
. A treatise on nervous and mental diseases, for students and practitioners of medicine. ting of the white matter in the centrefringed around with the convolutions. Fig. 18 represents a stilldeeper section of the liemisphere, showing in the middle line thegreat mass of commissural or connecting fibres running across fromone hemisphere to the other, the so-called corpus callosum. Whenthis corpus callosum is lifted (Fig. 19) the ganglia of the base, or thehanal rjanglia, are seen lying in the ventricles, the third ventricle inthe centre and the lateral ventricles one on each side. These basal 36 INTRODUCTORY, ganglia consist of several masses of gray matter. On each side ofthe median line is seen a large pear-shaped body, the optic the outside of this is a tail-sliaped body, commencing anteriorlyin a large club-shaped head, and running posteriorly to pass down-ward and inward to terminate in a tail. This, because of its shape,is known as the nucleus caudatus, or the caudate nucleus. When atransverse section is made through these basal ganglia at a still Fig. Drawing showing the centrum ovale and the corpus callosum. deeper level (Fig. 20), this caudate niiclens will have had the bodyof it between the head and the tail cut away so that only the headwill be seen anteriorly, whilst posteriorly only the tail will be is therefore evident that the caudate nucleus is arched, like a tad-pole, from its head to its tail, and it is this arch that is cut away bythe section of which we are now speaking. At this deeper level therecomes into view another mass of gray matter, the so-called lenticularor bean-shaped nucleus, to the outside of the caudate nucleus (i. e., it&severed head and tail) and the optic thalamus. This lenticularnucleus has three compartments, an outer, 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 collec
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