GENEKAL HISTOLOGY OF THE NERVOUS SYSTEM. 121 



processes) which divide and subdivide, and, it is said, form a 

 network which unites with a similar one proceeding from the 

 ganglionic bodies of the posterior roots. 



There is, in addition, a single straight process (naked axis- 

 cylinder), which, proceeding outward, soon receives a medul- 

 lary sheath. The nucleus is very large and circular, and usu- 

 ally displays a nucleolus. The contents of the body of the 

 corpuscles are more or less granular, and a mass of pigment in 

 granules is usually seen piled up in some one portion. The 

 corpuscles thus separated may be preserved in glycerine and 

 water, or, after staining in borax-carmine, in dammar varnish 

 or Canada balsam. In the posterior horns the corpuscles are 

 similar in character, but smaller. Gerlach claims that the 

 ganglionic bodies of the anterior horns are connected together 

 through networks formed of the branching processes given off 

 from each. Carriere, working under Prof. Kollman, of Mu- 

 nich, has examined the spinal cord of the calf in the fresh con- 

 dition, and has satisfied himself that the ganglionic corpuscles 

 are connected together by their fine processes, being thus in 

 agreement with Stilling, Wagner, Remak, and many others. 

 ArcTi.f. mikroskop. Anat.^ xiv., 2, 1877. 



Ganglionic bodies in the human 'brain. Thin sections 

 made through the cortex of the human brain show that there 

 are conical ganglionic corpuscles of medium size, whose base 

 is directed toward the white substance, and apex toward the 

 superficies. From either end processes are given off, from the 

 broad end several, and from the apex a single one ; both subse- 

 quently branch. In the upper strata the corpuscles are small- 

 est. Disseminated throughout this substance are two other 

 forms of corpuscles, one star-shaped (spider-cells), 1 and the 

 other the lymphoid corpuscles that belong to all tissues of the 

 body. Possibly the spider-cells, which have a variable number 

 of processes, are the cells of the neuroglia. Brush-cells 2 have 

 also been described. Perhaps they should also be regarded as 

 a variety of the spider-cells. 



Ganglionic bodies of the sympathetic system. They occur 

 either singly or in groups, interspersed among the nerve-fibres, 

 or in lines, or form enlargements in the nerve-plexuses, as 



1 Described by Jastrowitz. 



3 Arch. f. mikrosk. Anat, 1874, LXI., p. 93. 



