. A treatise on mental diseases. ut any possibility ofthe establishment of a collateralcirculation, while the other por-tions of the hemisphere retaintheir circulation intact. Thiscondition of affairs is more par-ticularly true for the great cen-tral region of the hemispheresthan for the anterior and poste-rior poles, as minor anastomosesbetween the arteries of the oppo-site hemispheres are exception-ally found. The arteries in each hemi-sphere from the circle of Willisare the anterior, middle, andposterior cerebrals (Fig. 1). Ofthese the middle cerebral, or Syl-vian artery, is the most volu-m
. A treatise on mental diseases. ut any possibility ofthe establishment of a collateralcirculation, while the other por-tions of the hemisphere retaintheir circulation intact. Thiscondition of affairs is more par-ticularly true for the great cen-tral region of the hemispheresthan for the anterior and poste-rior poles, as minor anastomosesbetween the arteries of the oppo-site hemispheres are exception-ally found. The arteries in each hemi-sphere from the circle of Willisare the anterior, middle, andposterior cerebrals (Fig. 1). Ofthese the middle cerebral, or Syl-vian artery, is the most volu-minous, and may be consideredas a direct continuation of theinterna] carotid. The anterior cerebral artery,by its main and terminal branch-es, carries the blood supply overthe whole of the internal aspectof the hemispheres as far as theoccipitoparietal fissure, includ-ing the corpus callosum ; to thatportion of the orbital convolutions from the median fissure out-wardly to the crucial furrow, and to the anterior pole of the hemi-. FlG. LIS Diagram of the Circle of Wil-1, Sylvian artery; the bulbousenlargement represents the confluenceof the internal earotitl with the Syl-vian artery ; 2, anterior cerebral artery ;3, posterior cerebral artery; 4, superiorcerebellar artery; 5, middle cerebellarartery ; 6, inferior cerebellar artery;7, vertebral artery; 8, anterior spinalartery; 9, anterior communicating ar-tery ; 10, posterior communicating ar-tery. After Van Gehiichten. 6 A TREATISE ON MENTAL DISEASES sphere ; upon the convex surface it supplies the whole of the supe-rior and middle frontal convolutions, as well as the upper third ofthe anterior central convolution running deeply into the sulcus ofRolando. The middle cerebral artery, larger and carrying more directlythe force of the vital stream, provides for the whole of the all-important central region of the hemispheres, the convolutions ofthe island of Eeil, the third frontal and inferior two thirds of theascending pariet
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