GENERAL CONFORMATION AND HISTOLOGY OF BRAIN. 



33 



its under surface is connected with some delicate masses of white 

 fibres which, arching over the cavity of the ventricle, pass down- 

 ward to the floor of the same before and behind. They belong 

 to the fornix. After they and the adhering choroid plexus are 

 divided and removed, we find ourselves looking into the cavity 



Cerebellum- 



FIG. 19. 



The brain opened by a horizontal section. Viewed from above. The two hemispheres are 



drawn somewhat apart. 



Unterhorn, Inferior horn. 



of the ventricle. The middle space is the cavity of the primary 

 fore-brain, now called the third ventricle. From the depths of 

 its anterior end ascends the margin of the secondary fore-brain, 

 the fornix. It is directly continuous with the median wall. 

 The latter is traversed by the fibres of the corpus callosum. 



