242 THE NERVOUS SYSTEM 



just external to the main body of gray matter and does not reach 

 the surface of the cord. Its fibers are likewise lost in the medulla 



a/I* 



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; G. i, internal capsule; N. I, lenticular nucleus; P, 

 pons; N.f, origin of the facial; Py, pyramids and their decussation; Ol, olive. Gr, 

 restiform body; PR, posterior root; AR, anterior root; x, crossed, and z, direct 

 pyramidal tracts. (Landois.) 



oblongata. (d) The column of Burdach (postero-external col- 

 umn) is situated posteriorly in a location corresponding to the 



