NEUROLOGY 





and ascend along the lateral surface of the spinal cord and medulla oblongata until 

 they arrive at the level of the olive, they then curve backward beneath the external 

 arcuate fibers into the inferior peduncle and pass into the cerebellum. Here they 

 give off collaterals to the dentate nucleus and finally terminate in the cortex of t;.ie 

 dorsal and superior portion of the vermis, partly on the same side, but to a great 



Medial lemniscus- 



Sensory decussation 



Fasciculus cuneatus 

 Fasciculus gracilis 



Nucleus cuneaius 

 Nucleus gracilis 



- - Posterior nerve Tools 



FIG. 759. The sensory tract. (Modified from Poirier.) 



extent by way of a large commissure to the opposite side. The fibers lose their 

 myelin sheaths as they enter the gray substance and terminate by end ramifications 

 among the nerve cells and their processes. Some of the fibers are said to end in 

 the nucleus dentatus and the roof nuclei of the cerebellum (the nucleus globosus, 

 nucleus emboliformis and nucleus fastigius) and others pass through them to ter- 

 minate in the inferior vermis. A few fibers of the dorsal spinocerebellar fasciculus 



