Nervous and mental diseases . an not beprovided owing to the smallness of the connecting arteries. Fromthe circle of Willis two distinct systems of arteries arise,—thebasal and the cortical. From the circle itself, and from aboutthe first inch of the six great arteries, the anterior, middle, andposterior cerebrals, short, direct vessels plunge into the brain tonourish the basal parts, ganglia, and capsules. These anastomose butslightly Avith one another, and are of the nature of terminal occlusion or destruction irreparably cuts off the circula- 198 DISEASES OF THE BRAIN PROPER.
Nervous and mental diseases . an not beprovided owing to the smallness of the connecting arteries. Fromthe circle of Willis two distinct systems of arteries arise,—thebasal and the cortical. From the circle itself, and from aboutthe first inch of the six great arteries, the anterior, middle, andposterior cerebrals, short, direct vessels plunge into the brain tonourish the basal parts, ganglia, and capsules. These anastomose butslightly Avith one another, and are of the nature of terminal occlusion or destruction irreparably cuts off the circula- 198 DISEASES OF THE BRAIN PROPER. tion from a given portion of brain-tissue. Those distributed to thelenticulostriate nucleus, the internal capsule, and a portion of thethalamus are derived from the stem of the middle cerebral. Onein particular, supplying the third layer of the lenticular ganglion,the caudate nucleus, and the upper portion of the capsule, is socommonly the seat of rupture that it was denominated by Charcot theartery of cerebral Fig. 81.—Distribution of the middle cerebral artery (Duret). The main cerebral arteries coursing up over the hemispheres in thearachnopia have each a definite cortical territory, and these only slightlyoverlap. They give off two sets of branches,—namely, delicate arteri-oles, nourishing the cortex, which they enter at right angles, and largerstraight, long branches, which pierce the cortex and supply the whitematter of the cerebrum (see Fig. 66, p. 167). These pass inward and
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Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
