NERVOUS POWER. 



359 



Fig. 380 : where four trunks (t, t) divide into 

 branches, which are again separated, and va- 



riously reunited in their course, Uke a ravelled 

 skein of thread, before they proceed to their 

 respective destinations. 



The ganglia are connected by nervous fila- 

 ments with every part of the brain and spinal 

 marrow, the great central organs of the nervous 

 system ; and they also send out innumerable 

 branches, to be distributed all over the body. 

 All the parts receiving blood-vessels, and more 

 especially the organs of digestion, are abun- 

 dantly supplied with ganglionic nerves ; so that, 

 by their intervention, all these parts have ex- 

 tensive connexions with the brain and spinal 

 marrow, and also with one another. The ganglia 

 are more particularly the points of union between 

 nervous fibres coming from many different parts : 

 they may be considered, therefore, as performing, 

 with regard to the vital functions, an office ana- 



