290 



PRACTICAL ANATOMY. 



surface forms the roof of the lateral ventricles, which are 

 two symmetrical, cuboidal, serous sinuses, presenting for 

 examination a roof, a floor, an inner wall and an outer 

 wall, an anterior cornu, a posterior cornu, and a middle 

 cornu. The roof of the lateral ventricle, formed by the 

 corpus callosum, as above stated, is arched from front to 



Sim 



FIG. 126. CENTRUM OVAL.E MAJUS. 



Ccl, corpus callosum ; Lt, ligamentuin tectuiu ; Slid, stria; longitudinales. 



back. The floor of each ventricle is made up of the 

 following structures : 



Corpus stnatum, Taenia semicircularis, 



Optic thalamus, Choroid plexus, 



Edge of fornix, Fornix. 



The floor of the ventricle is very irregular. The 

 outer wall is formed by the fibres of the cerebral hemi- 





