THE INTERNAL CONFIGURATION OF THE CEREBRAL HEMISPHERES 251 



lateral ventricle along this curved line, carrying before it an epithalial covering 

 from this thin membrane. In this way there is formed the chorioid plexus of the 

 lateral ventricle (Figs. 183, 184). The line along which this imagination occurred 

 is the chorioid fissure; and when the plexus is torn away, the position of the 



Lateral ventricle 



Inter-ventricular foramen 



Hippocampus' 

 Fimbria of hippocampus' / / 



Body offornix 



Optic tract / 

 Internal capsule 



/ Olfactory bulb 

 I \ Rhinoccele 



I Genu of corpus cattosum 



I Body of corpus callosum 

 Septum pellucidum 



Fig. 182. Dissection of the cerebral hemisphere of the sheep to show the lateral ventricle. 



Lateral view. 



fissure is indicated by an artificial cleft extending into the ventricle, which be- 

 gins at the interventricular foramen and follows the fornix and fimbria in an 

 arched course into the temporal lobe (Fig. 205). 



Hippocampus Chorioid plexus of lateral ventricle 



Fig. 183. Outline drawing from Fig. 182, to show the location of the chorioid plexus of the lateral 



ventricle. 



The chorioid plexus of the lateral ventricle (Figs. 183, 184, 188) is continuous 

 with that of the third ventricle at the interventricular foramen, from which 

 point it can be followed backward through the central part into the inferior 

 horn. It is coextensive with the chorioid fissure and is not found in the anterior 

 or posterior horns. It consists of a vascular network derived from the pia 



