THE SPINAL CORD. 



463 



tract can be traced down, as a rule, only as far as the mid-dorsal 

 region. As it descends it becomes smaller as its libers cross the 

 anterior commissure to enter the gray matter of the opposite 



FIG. 209. 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 pneumogastric nerves. XI. Spinal accessory nerve. 

 XII. Hypoglossal nerve. (Van Gehuchten.) 



side. Thus all the fibers of the pyramidal tract from each 

 cerebral hemisphere eventually are brought into relation with 

 the cells of the gray matter of the opposite side of the cord. 



