GANGLIA. 



301 



bundles, separated by connective tissue. The latter brings with 

 it the blood-vessels, -which break up into capillary networks in 

 the perineurium and endoneurium. We find in the bundles 

 of nerve fibres no true lymph- vessels. The lymph passes 

 between the individual nerve fibres and in spaces between the 

 lamellae of the perineurium. Nervi nervorum are present in 

 the nerve stems, and end partly in the vessels and partly in 

 the connective tissue. 



B. Ganglia. 



By a ganglion, we mean a larger or smaller collection of 

 nerve cells (ganglion cells) lying outside the central nervous 

 system in the course of a peripheral nerve. It contains groups 

 of ganglion cells and bundles of nerve fibres which run both 

 to and from the ganglion. The connective-tissue perineuriura 



FIG. 226. 



^Nucleus with 

 nudeolus 



Nucleated 

 'capsule 



Protoplasm 

 with concen- 

 trically 

 arranged 

 granules 



Obliquely cut 

 nerve fibres'**. 



Nucleated 

 capsule _,,^'1_ 

 surface , 



view I -a^ 



Longitudinally t ,^ -~ 

 cut nerve fibre 



Transversely 

 cut nerve fibre 



From a transverse section of a spinal ganglion of a rabbit. X 400. 



of the nerve bundles passes over into the ganglion, carrying 

 blood-vessels' between the ganglion cells. Numerous capil- 

 laries, formed from the breaking up of the arteries, surround 

 the individual cells. 



