100 HISTOLOGY. 



dichotomously at a little distance from the cell, and gives rise 

 to two nerve fibres, one running peripherally and one toward 

 the central nervous system. The two fibres formed by this 

 division separate at an angle like that of the arms of the letter 

 Y or T (Fig. 71, d). 



It has been shown that the spinal ganglion cells are uni- 

 polar in adults, but bipolar in embryos, the two embryonic 

 processes fusing to form one in the adult (Fig. 71). 



FIG. 70. 



L- ' 

 Dendrites 



___ Cell hoi 

 - Axone 



Purkinje cell from the human cerebellum, x 225. 



Bipolar cells (Fig. 71, a, b) are found in the spinal ganglia 

 of fishes and in the ganglion spirale. In such cells there are 

 two processes, one of which becomes the axone and the other a 

 dendrite. 



Multipolar cells (Fig. 68) possess one axone and many den- 

 drites. If one process runs a long distance and passes over 

 into a nerve fibre, we have to do with a cell of the so-called 

 Deiter's type ; while if the process runs only a short course arid 

 ends in the gray matter of the nervous system we have a cell 

 of the Golgi type. 

 ":Ac6ordkte ia .GJolgi/Nsuaseo, and others, the axone is the 



