A treatise on mental diseases : based upon the lecture course at the Johns Hopkins University, 1899, and designed for the use of practitioners and students of medicine / by Henry J. Berkley.

  • Berkley, Henry J. (Henry Johns), 1860-1940.
Date:
1900
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on mental diseases : based upon the lecture course at the Johns Hopkins University, 1899, and designed for the use of practitioners and students of medicine / by Henry J. Berkley. Source: Wellcome Collection.

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    not communicate with one another. The consequence of this non- anastomosis of the pial arteries is that definite areas of the cortex are nourished by a blood supply practically separate from that of the other portions, and as a re¬ sult when an embolus or throm¬ bus plugs one of the parent ar¬ terial stems arising from the polygon, the nutrient supply is entirely shut off from that ter¬ ritory without any possibility of the establishment of a collateral circulation, while the other por¬ tions of the hemisphere retain their circulation intact. This condition of affairs is more par¬ ticularly true for the great cen¬ tral region of the hemispheres than for the anterior and poste¬ rior poles, as minor anastomoses between the arteries of the oppo¬ site hemispheres are exception¬ ally found. The arteries in each hemi¬ sphere from the circle of Willis are the anterior, middle, and posterior cerebrals (Fig. 1). Of these the middle cerebral, or Svl- vian artery, is the most volu- minous, and may be considered as a direct continuation of the interna] carotid. The anterior cerebral artery, by its main and terminal branch¬ es, carries the blood supply over the whole of the internal aspect of the hemispheres as far as the occipito-parietal fissure, includ¬ ing the corpus callosum ; to that portion of the orbital convolutions from the median fissure out¬ wardly to the crucial furrow, and to the anterior pole of the hemi- Fig. 1.—Diagram of the Circle of Wil¬ lis. 1, Sylvian artery; the bulbous enlargement represents the confluence of the internal carotid with the Syl¬ vian artery ; 2, anterior cerebral artery ; 3, posterior cerebral artery ; 4, superior cerebellar artery; 5, middle cerebellar artery ; 6, inferior cerebellar artery; 7, vertebral artery; 8, anterior spinal artery; 9, anterior communicating ar¬ tery ; 10, posterior communicating ar¬ tery. After Van Gehuciiten.