THE CRURA CEREBRI 



257 



crusta are supposed to convey efferent impulses, and pass 

 to the corpus striatum and the cerebrum. 



It is evident that the function of the cfura is mainly to 



Nuclear loitKomli 



Clauitnln* 



FIG. 80. Human brain, with the hemispheres, removed by a 

 horizontal incision on the right side. 



4, trochlear; 8, acoustic nerve; 6, origin of the abducens; F, A, L, position of 

 the pyramidal (motor) fibers for the face, arm and leg; S, sensory fibers. (Lan- 

 dois. ) 



conduct messages to and from the parts above. It is said 

 that the locus niger is concerned in coordination of the move- 

 ments of the eye-ball and iris. 



17 



