512 



THE NERVOUS SYSTEM 



gray substance. Mingled with it and supporting it is the meshwork of the 

 neuroglia. 



The multipolar cells of the cord are either scattered singly or arranged in 

 groups, of which the following are to be distinguished on either side, certain 

 of the groups being more or less marked in all of the regions of the cord, viz., 

 those, a, in the anterior cornu, b, those in the posterior cornu, and c, intrinsic 

 cells distributed throughout the gray matter. 



The cells in the anterior cornu are large and branching, and each gives rise 

 to an axis-cylinder process which passes out in the anterior nerve root. These 



FIG. 359. From the Lower Lumbar Cord of Man, after a Preparation by Klonne and Miiller, 

 of Berlin (No. 11,153), stained by Weigert and Pal's method. A portion of the gray substance of 

 the ventral cornu with the adjoining portions of the lateral column is represented, showing an- 

 terior-horn cells and the fine medullated fibers which enter the gray substance from the lateral 

 column and surround the nerve cells, which here are provided with fine pigmented granules. High 

 power. (Kolliker.) 



cells are everywhere conspicuous, but are particularly numerous in the cervi- 

 cal and lumbar enlargements. In these districts they may be^divided into 

 several groups: i, A group of large cells close to the tip of the inner part of 

 the anterior cornu all the cells of the anterior cornu in the dorsal or thoracic 

 region are said to belong to this group; 2, several lateral groups, 20,, 2b, and 2C, 

 figure 360, on the outer side of the gray matter, and a certain number of cells at 

 the base of the inner part of the anterior cornu particularly well marked in the 

 thoracic region ; 3, cells of the posterior cornu these are not numerous. They 



