THE NERVOUS SYSTEM 



of the fluid is one of the causes of hydrocephalus, and, in 

 this condition, the whole ventricular system may become 

 enormously dilated. 



FIG. 13. Dissection to show the Floor of the Lateral Ventricle. 

 (TURNER'S Anatomy.} 



The roof of the lateral ventricle has been removed, along with the greater part of the 

 septum pellucidum. In addition the fornix has been divided and turned back- 

 wards, exposing the tela chorioidea (velum interpositum). 



a. Fornix. 

 , c. Columns of fornix. 



d. Tela chorioidea 



e. Corpus callosum, 



genu. 



f. Caudate nucleus. 



g. Stria terminalis (taenia 



semicircularis). 

 //. Thalamus. 

 /. Fimbria. 



in. Hippocampus. 

 n Bulbus cornu. 

 o. Trigonum collateral 

 (ventriculi). 



The tela chorioidea is itself overlapped by the free lateral 

 edge of the fqrijix, The body of the fornix consists of 



