64 



NERVOUS SYSTEM. 



spinal cord or the viscera, new ganglionic masses are found. 

 Of this class numerous globular clusters are arranged like 

 the rounds of a ladder on the nerves that return to the vis- 

 cera. The most remarkable of these groups are the semilunar 



Fig. 15. Direction and general distribution of the great sympathetic nerve. 

 (Dalton, " Human Physiology.") 



ganglion, called by Bichat the abdominal brain. Finally, at 

 a more distant portion in the path of the visceral nerves a 

 new series of ganglions are distributed in the walls ol the 

 organs, being ordinarily only of microscopical dimensions. 



