652 



PHYSIOLOGY. 



name of putamen. The two other segments are known as the in- 

 ternal and external segments of the globus pallidus. 



Hence it ensues that the corpus striatum has the general char- 

 acter of the letter c. Its upper extremity, or branch, being repre- 

 sented by the caudate nucleus; its lower branch by the lenticular 



Fig. 259. So-called Ganglionic Gray Matter of the Cerebral Trunk. 

 (After CHAEPY.) Gray Masses Superadded to the Sensori-motor Nuclei. 

 ( MORAT. ) 



1, Pontal nucleus. 2, Arciform nucleus. 3, Olive. 4, Speech. 5, Reticulat. 

 formation. 6, Trapezoid nucleus. 7, Superior olive. 8, Substant..cin. 9, Lateral 

 nucleus. 10, Locus coeruleus. 11, Locus niger. 12, Red nucleus. 13, Corpora 

 quadrigemina. 



nucleus. The point of union of the two forms the knee. The cor- 

 pora striata are of cortical origin, and not of central origin, as is 

 the thalamus. That is to say, the nerve-impulses of voluntary move- 

 ment ordered by the cortex descend to the corpora striata, where 

 they undergo transformation before appearing as muscular move- 

 ments. 



