THE NERVOUS SYSTEM 



1451 



bral hemorrhage (Charcot). Its course is outwards and upwards 

 round the outer aspect of the lenticular nucleus, between it and the 

 external capsule, and then through the internal capsule to the 

 caudate nucleus. The lenticulo-optic arteries supply the posterior 

 part of the lenticular nucleus and the anterior part of the optic 

 thalamus on its outer aspect. 



The cortical branches arise in the vicinity of the island of Reil, 

 and are as follows : (i) inferior external orbital, to the orbital surface 

 of the frontal lobe external to the internal orbital sulcus, and to 

 the inferior frontal gyrus ; (2) ascending frontal, to the posterior 



Fig. 607. — Coronal Section of the Cerebral Hemispheres made Onb 

 Centimetre behind the Optic Commissure (Charcot, from Duret). 



(The Arteries of this region axe shown). 



I. Area of Anterior Cerebral Artery 

 II. Area of Middle Cerebral Artery 

 III. Area of Posterior Cerebral Artery 

 V. V. Section.s of Anterior Cornua of Lateral 



Ventricles 

 P.P. Anterior Pillars of Fornix 

 C.N. Caudate Nucleus 

 L S.A. Lenticulo-Striate Arteries 

 CL. Claustrum 

 I.R. Island of Reil 

 E.C. External Capsule 



L.N. Lenticular Nucleus 

 I.e. Internal Capsule 

 O.T. Optic Tract (cut) 

 G.M. Grey Matter of Third Ventricle 

 O.C. Optic Conunissure 

 O.N. Optic Nerve 

 A.C. Anterior Cerebral .Artery 



C. Internal Carotid Artery 

 M.C. Middle Cerebral Artery 

 L.A. Lenticular Arteries 

 A.C.H. Artery of Cerebral Hemorrhage 



third of the middle frontal gyrus, and to the lower and greater part 

 of the precentral gyrus ; (3) ascending parietal, to the postcentral 

 gyrus and superior parietal g}Tus ; (4) parieto-temporal, which 

 traverses the posterior horizontal limb of the fissure of Sylvius, 

 and supplies the inferior parietal gyrus, and the posterior parts of 

 the superior and middle temporal gyri ; and (5) the temporal 

 branches, which emerge from the posterior horizontal limb of the 

 fissure of Sylvius, and supply the anterior and greater parts of the 

 superior and middle temporal g\Ti. 

 Fourth or Intracranial Part of the Vertebral Artery.— The verte- 



