chap, xvii.] THE MEDULLA OBLONGATA. 



the pyramids and farther on into the pons Yarolii and 

 cms cerebri. 



186. The greater portion of the anterior column 



M 



Fig. 88. Transverse Section through the Medulla Oblorigata in the 

 Region of the Pyramidal Decussation. 



f/j, Anterior 

 anterior c 



of posteri< 



Anterior pyramidal tract; r/ja, Interal nucleus of prey matter ; fa, part of 

 interior column not decussating ; ->ig, nucleus gracilis ; g, gelatinous nucleus 

 )f posterior horn ; 11, spinal accessory nerve. (Henle.) 



of white matter of the cord is situated deeper in the 

 medulla than the pyramidal tracts. 



(c) The lateral column of white matter of the 

 cord can be traced into the medulla as the lateral 

 tract. In the upper part of the medulla it becomes 

 hidden from view by the olivary bodies and the 

 transversely arranged white tracts. The lateral tract 



