14 THE NERVOUS SYSTEM 



(Fig. 6), and serves to separate the anterior parts of the 

 lateral ventricles from one another (Fig. 7). It is attached 

 posteriorly to a flattened band of white fibres, termed the 

 fornix, which, although separated in this way from the genu, 

 is closely applied to the inferior surface of the body of the 



FIG. 7. The Tela Chorioidea (velum interpositum) viewed from above. 



1. Tela chorioidea. 5. Septum pellucidum (cut). 



2. Chorioid plexus. 6. Vein of corpus striatum. 



3. Thalamus. 7. Stria terminalis. 



4. Caudate nucleus. 8. Great cerebral vein (of Galen). 



9. Internal cerebral vein. 



corpus callosum. The column (anterior pillar] of the fornix 

 sinks into the substance of the medial surface of the brain as 

 it descends to establish connexions with the corpus mamillare 

 (p. 1 6). 



The Thalamus is a large mass of grey matter which lies 



