SPINAL CORD AND COMMENCEMENT OF MEDULLA OBLONGATA. 179 



Just above the level of this section (Fig. 106) begins the 

 peculiar arrangement of fibres, etc., which go to make up the 



medulla oblongata. 



We found two pyramidal tracts in the spinal cord, one 

 situated in the anterior column, which conducted fibres toward 

 the brain which were added to it from each nerve-root on the 



XII 



FIG. 108. 



Section through medulla oblongata in the region of the most caudad of the roots of 

 the hypoglossal nerve. Pyramidal decussatioii almost completed. JVc, nucleus of the 

 funiculus cuneatus : Xll, hypoglossal nerve. All other marks same as in Fig. 107. 

 (After Horde.) 



opposite side of the cord, and a second, situated in the lateral 

 column, which received fibres from the anterior horn on the 

 same side. At the upper end of the spinal cord (Fig. 107, F>y} 

 the last-named tract forces its way in thick bundles through the 

 anterior horn of its own side and reaches the opposite anterior 

 column. Here it meets with the anterior pyramidal tract, and 

 from this point the crossed and the uncrossed pyramids are 



