190 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



severed from the compact portion of the gray matter. The 

 basal portion of the lateral horns, from which arise the fibres of 

 the motor accessory, are also separated from it a short distance 

 above the level of this section. The latter continues ventrad of 

 the former, as an independent column of gray matter, rich in 

 ganglion-cells, high upward into the pons ; and when the fibres 

 to the accessory are no longer given off it sends fibres to the 



tern 



FIG. 115. 



Section through the medulla oblongata at the level of exit of the vagus nerve. 



(Diagrammatic.) 



Hinterhorn, Posterior horn. Hinterstrangt, Posterior columns. 



Mot. Vagus etc. Kern, Motor vagus, etc., nucleus. Oliv. Zwitch. Schirht., Inter-olivary layer. 



Schleifenfaeern, Fibres of fillet. Seitenstrangkern, Nucleus of lateral column. 



Vonterhornrest, Remnant of anterior horn. 



vagus (and hypoglossal \ ), which at first pass dorsad and then 

 bend back to the respective nerves (motor vagus, etc., nucleus). 

 Still higher, we meet it as the nucleus of the facial nerve. You 

 will notice that, with the exception of the hypoglossal and the 

 nerves to the ocular muscles, all the motor fibres of the cranial 

 nerves originate in this upward prolongation of the basis of the 

 lateral horns of the spinal cord. 



