242 



THE NERVOUS SYSTEM 



zone is external to the anterior roots of the spinal nerves 

 and anterior to the crossed pyramidal tract and the direct 



FIG. 76. Course of the fibers for voluntary movement. 



ab, path for the motor nerves of the trunk; c, fibers of the facial nerve; B, 

 corpus callosum; Nc, nucleus caudatus; Gi, internal capsule; N, I, lenticular 

 nucleus; P, pons; N. f., origin of the facial; Py, pyramids and their* dccussa- 

 tion; Ol, olive; Gr, restiform body; P.R., posterior root; A.R., anterior root; x, 

 crossed, and s, direct pyramidal tracts. (Landois.) 



cerebellar fasciculus. Its fibers are lost in the medulla 

 above, (c) The mixed lateral column is just external to the 



