. A treatise on mental diseases. ond their laminte, andfind their ultimate divisions among the white fibres lying under thegray substance. The general disposition of both series is penetrate the cerebral pulp, subdivide at obtuse angles intonumerous branches which become finer and finer as they proceed,and eventually break up into capillaries, which pass on to smallveins without any distinct point of demarcation between them, theveins slowly increasing in size from numerous junctures with otherveins, until they again arrive at the surface of the cortex andpass outward into the pia
. A treatise on mental diseases. ond their laminte, andfind their ultimate divisions among the white fibres lying under thegray substance. The general disposition of both series is penetrate the cerebral pulp, subdivide at obtuse angles intonumerous branches which become finer and finer as they proceed,and eventually break up into capillaries, which pass on to smallveins without any distinct point of demarcation between them, theveins slowly increasing in size from numerous junctures with otherveins, until they again arrive at the surface of the cortex andpass outward into the pia. None of these arteries of the cortexanastomose with one another, nor do the veins communicate to anyconsiderable extent. As a result, each little territory of the cortexhas its own nutrient blood supply, entirely separate from that ofcontiguous territories, so that embolism, or disease of the arterydistributed to a certain territory, means the death of that area ofbrain substance whenever occlusion has become complete. All the. Fig. 2.—Diagram of the Distribution of the Cortical Circulation. External aspect of a hemisphere. + Area of distribution of the anterior cerebral artery Area of distribution of the middle cerebral artery. -+- Area of distribution of the posteriorcerebral artery.
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