Nervous and mental diseases . origin to the left will be recalled that allthe blood to the brain proper reaches the encephalon by the internal carotids and the four inlets are brought into intimate relation through thecircle of Willis. From side to side compensation in the circleis practically complete in case the lateral arteries are the carotid or anterior portion of the circle to the verte-bral, basilar, or posterior portion, full compensation can not beprovided owing to the smallness of the connecting arteries. Fromthe circle of Willis two distinct s
Nervous and mental diseases . origin to the left will be recalled that allthe blood to the brain proper reaches the encephalon by the internal carotids and the four inlets are brought into intimate relation through thecircle of Willis. From side to side compensation in the circleis practically complete in case the lateral arteries are the carotid or anterior portion of the circle to the verte-bral, basilar, or posterior portion, full compensation can 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 with one another, and are of the nature of terminal occlusion or destruction irreparably cuts off the circula-. Fig. 80.—Charcots diagram of the circulation at thehase of the brain. 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 hemorrhage.
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Keywords: ., bookcentury1900, bookdecade1910, bookid, booksubjectnervoussystem
