484 



THE BRAIN 



the form of a posterior horn, and downwards and anteriorly into the temporal 

 lobe as the inferior horn. The posterior horn can, at present, he opened 

 on the right side only. Carry the knife posteriorly through the medullary 

 substance which forms its roof, and remove a sufficient amount of this to 



Genu of corpus callosum 



Cavum septi pellucidi 

 Septum pellucidum 



Corpus callosum 

 turned to left side 



Foramen interventriculare 

 j Caudate nucleus 

 i i Thalamus 



Chorioid plexus 



Stria terminalis 



Trigonum collaterale 



Hippocamp 



Crus of forn 



Calcar avis 



Bulb of cornu 

 Hippocampus 



Forceps major 



l>ody of fornix Crus of fornix 



FIG. 194. Dissection to show the Lateral Ventricles. The trunk of the 

 corpus callosum has been detached from the genu and the splenium and 

 turned over to the left. 



give a complete view of the interior of this part of the cavity. Greater 

 difficulty will be experienced in opening up the inferior horn. Place the 

 point of the knife in the upper part of the horn, where it joins the central 

 part of the ventricle, and carry the blade in an antero-inferior direction, 



