284 ENDOCRINE GLANDS 



This question can be answered, but each ganglionie 

 plexus must be examined separately. 



As far as the cardiac ganglionie plexus is concerned, the 

 fibres arising from the thoracic and lumbar region of 

 the vegetative centres, only go through the ganglia without 

 stopping. All the fibres which end there come from the vagus. 

 The ganglion of Wrisberg must therefore, physiologically 

 belong to the vagus and not to the sympathetic. 



As regards the solar plexus, it seems here to be the 

 reverse and that it belongs entirely to the sympathetic, 

 the vagus goes through it without stopping. It must, 

 therefore, be considered as part of the sympathetic. 



Finally, as regards the inferior mesenteric plexus and its 

 dependency the hypogastric plexus, they are chiefly part 

 of the sympathetic system. At best the pelvic plexus has 

 a few endings in certain visceral ganglia which depend on 

 the hypogastric plexus. 



We have now to classify the visceral or parenchymatous 

 ganglia. These ganglia are found located against, or in 

 the walls of the viscera; lung, digestive tube, heart, 

 urinary system, genital system, even possibly in the wall 

 of the blood vessels. 



They are much more difficult to classify than the pre- 

 ceding ones. It seems, as do the splanchnic ganglia, 

 that they are not composed of one type. It appears as if 

 there were: 



1. Ganglia belonging to and depending on the vege- 

 tative nerve axis. 



2. Ganglia, physiologically autonomous, which could 

 be affected and commanded by the fibres coming from the 

 nerve axis, but for a certain length of time, these systems 

 can function alone. 



In the first group we must include certain ganglia of the 

 broncho-pulmonary system, of the gastro intestinal tract, 



