XXX.J THE BEAIN. S23 



across the Sylvian fissure (cp, 0. § 6). Note on 

 surface exposed 



a. The band of white substance, the inner 

 capsule^ laterally of the optic thalamus. 



5. The bands of white substance, corona radi- 

 ata, continuous with the inner capsule and 

 spreading out into the convolutions of the 

 cortex. 



c. The corpus callosum stretching between the 

 coronsB radiatse of the two sides. 



d. The nucleus caudatus of the corpus stria- 

 tum, a roundish grey mass, dorsal and lateral to 

 the optic thalamus, and partially surrounded 

 by the deep white band of the corona radiata; 

 it may be very small in this section, 



e. The nucleus lenticularis of the corpus stria- 

 tum; this occupies a small triangular space 

 just outside the inner capsule, and has a num- 

 ber of fibres running transversely through it 

 from the inner capsule ; on its lateral margin 

 is a thin white band, the outer capsule. 



f. The anterior pUlar of the fornix will also be 

 seen cut across, near the ventral surface of 

 the grey substance close to the third ventricle; 

 note also the position of the fornix. 



C. Convolutions and fissures of the Dog's brain. 



1. Observe on the ventral, anterior surface of 

 the brain the olfactory bulb (this may have 



21—2 



