ON THE CHOR01D PLEXUSES 



57 



supply of that fluid is thus obtained, which finds its way 

 throughout the entire intra-spaces of the central nervous 

 system, after which it commingles with the inter-meningeal 



FlG. 2. VIEW OF THE UPPER SURFACE OF THE VELUM INTERPOSITUM, 



CHOROID PLEXUSES, AND CORPORA STRIATA. (From Sappey after 

 Vicq-d'Azyr.) . 



i, fore part of the tela choroidea or velum interpositum ; 2, choroid plexus; 3, left 

 vein of Galen partly covered by the right ; 4, small veins from the front of the 

 corpus callosum and the septum lucidum ; 5, veins from the corpus striatum ; 

 6, convoluted marginal vein of the choroid plexus ; 7, vein rising from the 

 thalamus opticus and corpus striatum ; 8, vein proceeding from the inferior 

 cornu and hippocampus major; 9, one from the posterior cornu ; 10, anterior 

 pillars of the fornix divided in front of the foramen of Monro ; n, fornix divided 

 near its middle and turned backwards; 12, lyra; 13, the posterior pillar of the 

 fornix ; 14, the splenium of the corpus callosum. 



lymph, or fluid, to form the material of the neuro-lymphatic 

 circulation. In the performance of this function of 

 lymphogenesis these organs become secondarily a system 

 of elimination for securing the removal from the intra- 

 spaces of the brain and cord whatever of neuroglial waste 

 has found its way thither, besides affording the means 



