946 



THE NERVE SYSTEM 



the gray tissues of the anterior perforated substance (Fig. 681). It constitutes 

 an inner olfactory arc as distinguished from the epicallosal or outer arc, repre- 

 sented by the atrophied indusium and its longitudinal striae. 



CORPUS CALLOSUM 



ANTERIOR CORNU OF. 



LATERAL VENTRICLE 



CORPUS CALLOSUM 



(ROSTRUM) 



CLAUSTRUM 



FIG. 700. A frontal section through the brain in the plane of the junction of caudate and lenticular nuclei. 



LATERAL VENTRICLE 



CAUDATE NUCLEUS 



INTERNAL CAPSULE 



ANT. PILLAR 

 OF FORNIX 



CLAUSTRUM 



ANTERIOR 

 COMMISSURE 



AMYGDALINE 

 NUCLEUS 



FIG. 701. A frontal section of the brain in the plane of the anterior commissure. 



The Septum Lucidum (septum pell-ucidum). The so-called septum lucidum 

 really consists of two vertically placed laminae or hemisepta. Between them lies 

 a narrow, enclosed space, the cavum septi pellucidi (psewlocele; fifth ventricle), 



