i68 



ELEMENTS OF HISTOLOGY. [Chap. xx. 



(perineural) sheath. The small and large branches 

 form always rich plexuses. 



224. In connection with the macroscopic and 

 microscopic sympathetic nerve-branches, are gang- 

 1 ionic enlargements. They occur in some organs very 

 numerously e.g., alimentary canal, urinary bladder 



(Fig. 97 and Fig. 

 98), respiratory or- 

 gans and are of 

 all sizes, from a 

 few ganglion cells 

 placed between, or 

 laterally to, the 

 nerve-fibres of a 

 small bundle, to 

 huge oval, spheri- 

 cal, or irregularly- 

 shaped masses of 

 ganglion cells placed 

 in the course of a 

 large nerve-bundle, 

 or situated at the 

 point of anastomo- 

 sis of two or more 

 nerve-branches. 



The ganglion 

 cells (Fig. 99) are 

 of very different 

 sizes, each possess- 

 ing a large oval or 

 spherical nucleus 

 with one or two 

 nucleoli. Their 

 shape is spherical 

 or oval, flask- 

 shaped, club-shaped, or pear-shaped ; they possess 

 either one, two, or more processes, being uni-, bi-, 



Fig. 99. Sympathetic Ganglion Cell of Man. 



The ganglion cell is raultipolar ; each process re- 

 ceiving a neurilemma from the capsule of the 

 cell becomes a non-inedullated nerve-fibre. 



