464 



GENERAL BIOLOGY 



nized in the cortex, differing considerably in form and in 

 mode of branching of their cell processes, as well as in posi- 

 tion, and all of them, extremely complicated. A single 

 cell from one of the middle layers of the human cortex is 



X'' 



y 



- z 



FIG. 263. A single cell from the cerebellar cortex of the human brain, x, its 

 dendrites. y, the cell body. 2, the axone or nerve fiber. (From Stohr) 



shown in figure 263. The most remarkable feature of it is 

 the extraordinary richness of the branching of the dendrites. 

 These are interlaced and come into contact with the termini 

 of the processes of other cells that lie in other parts of the 

 hemispheres, and in other centers of the brain and cord. In 

 the entire cortex there are said to be millions of such cells. 

 If here, as elsewhere in the nervous system, nerve cell 

 processes are channels for intercommunication channels 



