FASCICULUS CEREBRO-SPINALIS IN THE RAT 



505 



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Fig. 1 Ventral part of the posterior funiculus of the spinal cord of a rat in 

 which the motor cortex of the left hemisphere had been destroyed 50 days before 

 the animal was killed. The pyramidal tract of the right side has degenerated. 

 Pyridine-silver. X 167. 



study of free hand sections of the hemisphere under the dis- 

 secting microscope, no damage had been done to these under- 

 lying structures; although there is a possibility that the highest 

 part of the corpus striatum may have been slightly damaged in 

 some cases. 



The spinal cords of rats Nos. 1, 2, 3, 4, 6 and 7 were prepared 

 by the pyridine-silver method and all except that of No. 7 showed 

 an almost complete degeneration of the pyramidal tract on the 

 right side. The contrast between the normal and degenerated 



