226 TWENTY-SECOND LECTURE. 



To the anterior roots of the spinal cord correspond, together 

 with the hypoglossus, the nerves of the muscles of the eye ; 

 the abducens, trochlearis and oculo-motorius. 



We cannot here enter further into the nerve nuclei. The 

 centres of the hypoglossus and accessorius, with large multi- 

 polar cells, are located furthest below. 



What becomes of the columns of the spinal cord within the 

 medulla oblongata ? 



As we have already remarked, there can here be only a 

 simplified continuation of the same. 



The anterior columns, passing to the side of the raphe, and 

 displaced by the pyramids, may be followed far under the 

 pons ; they are perforated by zonal fibres and gray substance, 

 and finally, after the intercalation of ganglion cells, are still 

 finely fibrillated. They appear to pass towards the cerebrum 

 and cerebellum. 



The lateral columns, forming the funiculus lateralis, reach, 

 in part, the cerebrum. Their fibres are interrupted and dis- 

 placed by the formatio reticularis, the Deiter's nucleus, the 

 inferior, accessory and superior olivary bodies. 



The posterior columns of the spinal cord do not, as we 

 formerly conjectured, continue as the crura cerebelli ad 

 medullam oblongatam directly into the cerebellum. Their 

 processes in the medulla oblongata, the funiculus gracilis 

 and cuneatus, are interrupted by intruded gray substance, 

 the so-called ganglia post pyramidalia, and here cease as 

 white fibrous masses. The gray continuations pass in 

 part into these crura, in part (crossed and uncrossed) to 

 the corpora olivia, and, finally, increased in size, to the pyra- 

 mids. 



The pyramids commence with fine nerve fibres from the for- 

 matio reticularis. With them are associated nerve fibres 

 from the lateral and posterior columns. After the decussa- 

 tion they pass in the pedunculi cerebri to the cerebrum, 

 to probably reach the corpora striata, the nucleus lenticularis, 

 and even the cortex of the hemispheres. 



The inferior corpora olivaria, in man, contain in their gray 



