GRAY MATTER OF MEDULLA. 



it reaches its full stature and gathers into itself the fibers of the 

 funiculus cuneatus and the descending root of the vestibular nerve; 

 thence it sends its own axones upward in the medial fillet and the 

 external arcuate fibers. Near the lower end of the medulla there 

 is a small lateral bud of gray matter connected with the nucleus 

 funiculi cuneati, to which it is accessory and, like it, is imbedded 

 in the funiculus cuneatus. It occupies the position of the dorsal 

 nucleus (Clarki) in the spinal cord, and is called the accessory 

 nucleus juniculi cuneati. 



The nuclei funiculi gracilis et cuneati form the first relay station 

 in the spino-cerebral path for impressions of the muscular and 



Funiculus gracilis 

 Funiculus cuneatus 



Nucleus funiculi gracilis 



Nucleus funiculi cuneati 



Tractus spinalis 



n. trigemini 



(Post.) Cerebellc-spinal 

 tract 



Ant. cerebello-spinal, 

 spinb-thalamic, rubro-spinal 

 triangular tracts 



Nucleus tractus spinalis 

 n. trigemini 



and 



Pyramid 



Head of ant. columna 



Medial and anterior 1 Fasciculus 

 longitudinal bundles j" proprius 

 Pyramidal decussation 



Fig. 95. Section of the medulla oblongata at the pyramidal decussation. 

 (Original.) 



tactile senses, and lesions in them cause ataxia. They also lie 

 at the dividing of the ways; the direct path continuing through 

 the fillet decussation and the medial fillet to the thalamus, and 

 the indirect path running through the arcuate fibers to the cere- 

 bellar cortex. From the cerebellar cortex the impulses proceed 

 cerebralward through Purkinje's neurones to the dentate nucleus 



