CELL MASSES IN THE FOREBRAIN 439 
; PE EOS Fe 
7 a (IP Raine te (RY Hares 
Fig. 10 Medial view of the model with the hippocampus removed. The 
pallial thickening is perhaps better seen here than in the dissected brain (fig. 4). 
That part of the thalamus which appears behind the anterior commissure is con- 
tinuous laterally with the tail of the caudate. The ventricular ridge and general 
pallium are separated from the striatum by a cut which follows the middle ventric- 
ular groove to the end of its dorsal branch, and by a cut which runs diagonally 
downward and forward from the end of the first one and disappears behind the 
hypothalamus in this view. The bifurcation of the middle ventricular groove is 
seen just behind the upper angle of the thalamus. From this point the temporal 
branch descends into the temporal horn of the ventricle. Its course forms a 
letter X with the second cut above described. Following the course of this groove 
is the small ridge described in the text as imbedding part of the stria terminalis 
related to the basal lobe of the ventricular ridge. From this ridge the bundle 
goes forward in the caudate. The tail of the caudate barely appears in this 
figure behind the thalamus (n. ¢.) and bounded by the temporal branch of the 
middle groove. The thickening and fusion of the caudate with the nucleus of 
the lateral olfactory tract in the amygdaloid complex lies just lateral to this point. 
It is in this region that a great hypertrophy of the common caudate-amygdaloid 
mass produces the ‘epistriatum’ in the lizards. The triangular area between the 
two cuts above described belongs to the lentiform nucleus. Note that the general 
pallium is continuous with the lentiform nucleus through the basal lobe of the 
ventricular ridge (medial nucleus of amygdaloid complex). 
