NER VE- TISSUE. 1 1 3 



common. The cell-body is finely granular and 

 delicately striated, often containing pigment gran- 

 ules. The nucleus is large, well-defined, vesicular in 

 appearance, and usually contains a large shining 

 nucleolus. They all have at least one process, most 

 of them have more ; and they are hence often 

 classified as unipolar, bipolar, multipoint ganglion- 

 cells. The above-mentioned striations in the cell- 

 body are often seen to continue out into the 

 processes, and are apparently continuous with the 

 striations or fibrils of the axis cylinder of the 

 nerves. 



In many nerve-cells, especially in the spinal cord, 

 we recognize two distinct kinds of processes: first, 

 those which, soon after leaving the cell, divide and 

 subdivide until they become extremely fine and 

 delicate, and, in some cases, seem to join equally 

 fine processes of other cells such delicate cell-pro- 

 cesses make up a considerable portion of the gray 

 matter of the cord, and are called branching processes ; 

 second, such as pass off from the cell, and, without 

 dividing, presently are surrounded by a sheath of 

 myelin, and become medullated nerve-fibres ; the 

 latter are called axis-cylinder processes. 



Nerve-cells vary greatly in size, and although the 

 forms which they present are most diverse, we yet 

 find that a considerable proportion of those found 

 in different parts of the nerve-centres have certain 

 broadly typical forms. Thus, among the cells in the 

 gray matter of .the spinal cord, we find larger and 



