114 NORMAL HISTOLOGY. 



smaller fusiform or spheroidal branching cells, and, 

 which are more characteristic, large, irregular-shaped 

 cells, with several branching processes and a well- 

 defined axis-cylinder process. In the cortex of the 

 cerebrum, while we find variously shaped larger and 

 smaller cells, we find also characteristic pyramidal 

 cells of varying size, which give off processes from 

 both the base and apex. In the cerebellum, we find 

 just at the inner edge of the gray cortical matter, 

 irregular globular or ovoidal cells, which, from the 

 side toward the surface of the brain, send off one or 

 two branching processes ; on the opposite side we 

 can usually demonstrate the commencement of a 

 single delicate process, which is supposed to cor- 

 respond to the axis-cylinder process, though, since 

 it almost invariably breaks off near the cell in the 

 attempt to isolate the latter, its nature is not yet 

 definitely determined. These cells are called Pur- 

 kinjes cells. 



The ganglion-cells of the sympathetic are usually 

 globular or ovoidal, and are peculiar in that each 

 cell is surrounded by a distinct capsule of connective 

 tissue lined with flattened cells, resembling endo- 

 thelium. They have one or more processes which 

 pierce the capsule and become non-medullated 

 nerve-fibres. 



TECHNIQUE. 



Fresh Nerve. A bit of fresh nerve the sciatic of the 

 frog answers very well should be carefully and rapidly 



