596 



NERVOUS SYSTEM 



In the white substance are found arcuate fibres that connect 

 different adjacent areas of gray matter. 



The superior peduncles of the cerebellum pass to the cerebrum 

 through the longitudinal tract of the pons Varolii. The middle pe- 

 duncles connect the two lateral lobes through the transverse tract of 



Fig. 150. Cell o f Pur kinje, x 170 (Learning) .1 



This figure shows the arborizing dendrites extending upward from the cell-body and a neurite, with 

 one collateral passing to the left in the granular layer. 



1 This figure is an exact reproduction of an actual object stained by the method of Golgi. 

 The dendrites extend upward toward the border of the gray matter. The cell-body lies near 

 the granular layer. From the cell-body, a neurite passes into the granular layer toward the 

 white matter. The dendrites belong to a cell-body that has, superimposed, another cell-body 

 with a neurite. The two cell-bodies are fused as well as the granular substance below. The 

 dendrites of the superimposed cell-body were wiped away. Aside from the fusing of the 

 cell-bodies and of the granular layers, the picture has not been touched and is an exact repro- 

 duction of the actual appearances. It is unusual to see a neurite extending for any considerable 

 distance from a Purkinje cell. 



