Nervous and mental diseases . important question is that of the patho-logical diagnosis. What is the lesion ? Comparatively few pathologicalprocesses are found in diseases of the brain, but their effects and re-sults are numerous and serious. These diseases fall into groups relatedto : (1) The arterial supply ; (2) the venous return ; (3) inflammatorydisturbances of the brain-substance, and (4) new formations. Surgicalconditions, such as penetrat-ing wounds, are left to worksproperly covering such acci-dents. We first turn our atten-tion to the arterial supply of thebrain. Anatomical Considera
Nervous and mental diseases . important question is that of the patho-logical diagnosis. What is the lesion ? Comparatively few pathologicalprocesses are found in diseases of the brain, but their effects and re-sults are numerous and serious. These diseases fall into groups relatedto : (1) The arterial supply ; (2) the venous return ; (3) inflammatorydisturbances of the brain-substance, and (4) new formations. Surgicalconditions, such as penetrat-ing wounds, are left to worksproperly covering such acci-dents. We first turn our atten-tion to the arterial supply of thebrain. Anatomical Considera-tions.—The arterial supplyof the encephalon furnishesthe anatomical basis of somebrain-lesions, and presents prac-tical points of great impor-tance. The left carotid, leav-ing the arch of the aorta ona tangent that conforms to thenatural blood-current, favorsthe passage of emboli of car-diac origin to the left will be recalled that allthe blood to the brain properreaches the encephalon by theThese four inlets are. Fig. 80.—Charcots diagram of the circulation at thebase of the brain. brought intocircle of Willis. From side internal carotids and tlie relation through the 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 Avith one another, and are of the nature of terminal occlusion or destruction irreparably cuts off the circula- 198 DISEASES OF THE BRAIN PROPE
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Keywords: ., bookcentury1900, booksubjectmentalillness, booksubjectnervoussys
