X\ll 



THE NERVOUS SYSTEM 



189 



across from one hemisphere to the other. They are connected 

 to the other parts of the brain chiefly by the crura cerebri, but 

 also by the optic thalami. Towards the under surface or base 

 of the hemisphere lie special structures, one on each side ; 



FIG. 86. Side view of the brain and upper part of the spinal cord. 

 C, The convoluted surface of ihe right cerebral hemisphere; Cf>, cerebellum; 

 ,!/.('/, medulla nblon|(ata ; .V, spinal i-ord with spinal nerves; A, the bodies, 

 and -S"/, the spines of the vertebra:. 



these are called the two corpora striata. The surface of 

 the cerebral hemispheres is thrown into folds called convolu- 

 tions, with fissures more or less deep between them ; this gives 



it .1 \erv ( haractfristic appearance. 



