938 



THE NERVE SYSTEM 



the corpus callosum. The general outline of this part of the ventricle, in a frontal 

 section, is triangular (Fig. 700). 



The body of the cavity is curved with its convexity dorsad; its outline in trans- 

 sections varies from the triangular to a mere slit which slopes slightly meso- 

 ventrad. It is wholly roofed in by the corpus callosum (pars froutoparietalis). 

 His floor is formed by the following structures named in order from its ectal toward 



ANTERIOR 

 COMMISSURE 



LENTICULAR 

 NUCLEUS 



HIPPOCAMPAI 

 DIGITAT10NS 



COLLATERAL 

 EMINENCE 



FTG. 690. Dissection showing the left lateral ventricle (paracele) exposed. 



its ental limit: (1) caudate nucleus or caudatum; (2) a groove which marks the 

 line of coalescence of caudate nucleus and thalamus and lodges the taenial vein 

 and a narrow fibre strand the taenia semicircularis, beneath the ependyma; 

 (3) a reflexion of the ependyma onto a narrow area of the thalamus; (4) the 

 choroid plexus of the lateral ventricle (paraplexus); (5) the thin, sharp (fimbriated) 

 edge of the fornix. The caudate nucleus narrows rapidly as it passes caudad. 



