158 THE ORIGIN OF THE NERVOUS SYSTEM 



46 



47 



FlGS. 45-47. — Vi£. 45, motor cell <>f ventral horn of spinal cord from 

 human embryo 30cm. long (from Barker, igoi, after von Lenhossek); 

 Fig. 46, pyramidal neuron of < erebral cortex of rabbit (from Cajal, 1909); 

 Fig. 47, neuron with short, branching axon, from cerebral cortex (from 

 Cajal, 1909). 



