THE BRAIN. 



401 



Netirtixis. 



angles to the lamellae of the cerebellum, and therefore 

 sections of the cerebellum should be made in this 

 plane. 



Granular Layer. This layer is densely packed 

 with nerve cells of two varieties. The granular 

 cells are most numerous, small, and have only a few 

 dendrites that end in hook-like telodendria. The 

 neuraxes from these cells pass vertically into the 

 molecular layer, where many of them form a T-- 

 shaped division, the two end branches passing par- 

 allel with the laminae and therefore into a plane 

 vertical to that of the den- 

 drites of the Purkinje cells. 

 Large stellate cells form the 

 second variety of this layer. 

 They are few in number 

 and lie close to the mo- 

 lecular. Their dendrites 

 branch in all directions and 

 their neuraxes form telo- 

 dendria among the granu- 

 lar cells. 



The medullary substance 

 may be divided into centri- 

 petal fibers, those that 

 carry nerve impulses toward 

 the granular and molecular 

 layers, and centrifugal fibers; 

 those that carry impulses in the opposite direction. 

 The latter are the neuraxes of the cells of Purkinje. 

 The centripetal fibers are the mossy fibers, that form 

 mossy telodendria in the granular layer, and also so- 

 called climbing fibers that pass through the granular 

 26 



Claw-like telodtn- 

 drion oj dtndrilc. 



Fig. 277. Granular cell 

 from the granular layer of 

 the human cerebellar cortex. 

 Chrome-silver method (Bohm 

 and Davidoff). 



