122 FLORENCE R. SARIN 



ceau leniiculaire de Forel. In view of its relations, it would 

 seem to me that it might be termed the fasciculus rubro-lenticu- 

 laris of Forel. If one bears in mind the oblique plane of Forel's 

 sections as compared with the models it will be seen that his 

 figures 17 and 18, plate 8, which run in the direction of the fibres 

 of bundle 19 in my fig. 4, are in the very best plane to show the 

 course of the lenticular fasciculus around the medial edge of 

 the crus and into the globus pallidus. The same sections must 

 also show, as the}^ do, the lemniscus fibres within the external 

 medullated lamina of the thalamus. 



In this connection it will be well to make clear that the rubro- 

 lenticular fasciculus of Forel (^2) is not the same as von Mona- 

 kow's^ dorsal Antheil der Linsenkernschlinge notwithstanding 

 the fact that he identifies it with Forels' H2. From a study of 

 von Monakow's figures 21-30, it is clear that he is dealing with 

 two different bundles both of which he calls H2. The first, which 

 he identifies with Forel's H2, and labels mC] , turns into the globus 

 pallidus around the lateral border of Luys' body while the true 

 Forel's fasciculus as shown in Forel's figures and in the models 

 curves around the mesial border of Luys' body, and is shown in 

 von Monakow's figs. 30-34, labeled H2 and Lisch C. The bundle 

 which von Monakow calls the dorsal Antheil der Linsenkernschlinge 

 is also medullated at birth. It connects Luys' body with the 

 globus pallidus, but cuts directly through the crus at the lateral 

 border of the nucleus hypothalamicus of Luys, instead of curving 

 around the medial edge of the crus. This bundle will be considered 

 in a moment, but it is not the same as the more medial fasciculus 

 rubro-lenticularis which is not connected with the Luys' body. 

 Obersteiner^" identifies the bundle which curves around the lat- 

 eral border of the nucleus hypothalamicus of Luys as Forel's H2 

 thereby agreeing with von Monakow. To the bundles which 

 in the adult, curve around the mesial border of the crus and con- 

 nect with the lenticular nucleus, Obersteiner gives the general 



' von Monakow, Experimentclle unci pathologisch-anatomisch. Untersuch- 

 nngen uober die Ilaubenrcgion, den Sehhiigel, und die liegio-subtiialamica. Arch, 

 f. Psych, u. Nervenkr., 27, 1875, S. 29.) 



'" Obersteiner, Anleitung beim Studium des Baues der Nervosen Centralorgane 

 Vierte Auflage, Leipzig und Wien, Franz Dcuticke, 1901, S. 377 u. 559, figs. 168 — 

 220. 



