THE NERVOUS TISSUES. 



153 



enable a determination of their source. A few of the most charac- 

 teristic types are here figured and may receive brief consideration. 

 In the anterior horn of the spinal cord are found large multipolar 

 neurones (motor neurones), with numerous dendrites, which termi- 

 nate after repeated branching in the neighborhood of the cell-body, 

 while the neuraxis with its collateral branches proceeds from the 

 cell-body and becomes a part of a nerve-fiber. (Fig. 1 10.) 



In the cerebellum are found large neurones, discovered by Pur- 

 kinje, and known as Purkinje's cells, with flask-shaped cell-body, from 

 the lower portion of which arises a neuraxis with collateral branches, 



b -- 



Branching of a 



dendrite. 



Neuraxis and 

 collaterals. 



Fig. 112. Pyramidal cell from the cerebral cortex of man ; chrome-silver method : 

 a, b, c, Branches of a dendrite. 



from the upper portion one or two very large and typic dendrites 

 the smaller branches of which are beset with irregular granules. 

 (Fig. in.) 



In the cortex of the cerebrum occur large neurones, each with a 

 cell-body the shape of a pyramid (pyramidal cell of the cerebral 

 cortex), from the apex of which arises one large dendrite, and from 

 angles at the base, or from the sides of the cell-body, several smaller 

 dendrites. The neuraxis arises from the base directly or from one 

 of the basal dendrites. (Fig. 112.) 



