462 THE BRAIN 



segment of the divided brain on the lower segment, and trace 

 the continuity of the caudate nucleus, along the floor of 

 the central part of the lateral ventricle, from the divided tail, 

 posteriorly, to the divided head, anteriorly. Then turn the 

 lower segment of the section upside down and trace the tail 

 of the caudate nucleus, along the roof of the inferior horn of 

 the lateral ventricle, to the amygdaloid tubercle at the 

 anterior end of the roof. (15) Immediately to the medial 

 side of the divided tail of the caudate nucleus is the thin 



Longitudinal fissure 



Genu of corpus callosum 



Corpus callosum (genu)' / Caudate nucleus 



Longitudinal fissure, ; Caudate nucleus (in section) 



Anterior horn of lateral ventricle 



FIG. 184. Frontal section through the Frontal Lobes of the Cerebrum. The 

 posterior surface of the anterior part of the cerebrum is depicted so that 

 the reader is looking into the anterior horns of the lateral ventricles from 

 behind. 



strand of white fibres, called the stria terminalis, which was 

 noted previously in the floor of the central part of the 

 lateral ventricle (see p. 431). Trace it also along the roof 

 of the inferior horn to the amygdaloid tubercle. 



Examine next the series of vertical transverse sections and 

 note (i) That, in the first section, which passes through the 

 posterior part of the frontal lobe, the head of the caudate 

 nucleus and the anterior part of the lentiform nucleus are 

 fusing together, ventro-lateral to the anterior horn of the 

 lateral ventricle (see Fig. 185). Note also that, as they 

 blend, a striate appearance is produced by the intermingling 



