EMBRYOLOGY AND COMPARATIVE ANATOMY OF BRAIN. 



17 



Many fibres which originate in the cerebrum and pass into 

 the more deeply situated portions of the nervous system must, 





FIG. 9. 



Frontal section through the corpus striatum of a human embryo of 16 weeks. Be- 

 tween the rudiments of the nucleus caudatus and those of the nucleus lentiformis can 

 be seen the internal capsule, in which also fibres can be seen passing from the wall of the 

 hemisphere. Notice the arrangement of the cells and the course of the fibres. 



Hemisph'drenwand, Wall of hemisphere. 



in order to reach their destination, pass directly through the 

 corpus striatum. This structure is, therefore, divided into two 

 portions, an inner and outer, by the mass of passing fibres. 



