THE SPINAL CORD 



for the transmission of motor or volitional impulses from the encephalon 

 to the spinal cord. 



FIG. 231. DIAGRAM OF THE PYRAMIDAL TRACT OR MOTOR PATH. III. Common oculo-motor 

 nerve. IV. Pathetic nerve. V. Motor division of the trigeminal nerve. VI. The abducens 

 nerve. VII. Facial nerve. IX. and X. Motor divisions of the glosso-pharyngeal and pneumogas- 

 tric nerves. XI. Spinal accessory nerve. XII. HypoglossaJ nerve. (Van Gekuchten.) 



The pyramidal tracts are also the conductors of the nerve impulses dis- 

 charged by the cells of the cerebrum during the occurrence of the affective 

 or emotional states, that excite to activity the lower nerve centers; those that 

 36 



