304 ENDOCRINE GLANDS 



tant fact is: The extension of the vegetative enervation 

 assured by the vagus, which controls the gastro intestinal 

 tract and its embryological derivatives, such as the 

 respiratory tract and the digestive glands. This impor- 

 tance of the vagus is further emphasized if we realize that 

 the pelvic plexus completes the inferior portion of the 

 gastro intestinal tract. We must, therefore, group as one 

 system these two anatomical entities, the vagus and the 

 pelvic plexus. We must also remember that from the 

 bulb arise vegetative fibres which go to the glands located 

 at the upper portion of the openings of the respiratory and 

 digestive tracts; these are annexed to the VII and IX 

 cranial (system of the lacrymo mucus, facial, inferior and 

 superior salivary nuclei). We can physiologically sepa- 

 rate the central splanchnic vegetative system of the vagus, 

 from the homologous systems of the pelvic plexus and the 

 other vegetative bulbar nuclei (exception being made of 

 the nucleus annexed to the Xllth). 



This should go under the name of nervous vegetative 

 digestive system, including under the name of digestive 

 the various evolutions of the gastro intestinal tract and 

 its physiological annexes. 



This leaves us only one vegetative central organic 

 system; the vegetative system annexed to the ocular 

 muscle. We have seen that physiologically this system 

 is more or less opposed to the ocular enervation coming 

 from the true sympathetic. We can, therefore, classify 

 the system of the III in the same group as the nervous 

 digestive systems and oppose to the true sympathetic a 

 second system which I have called the parasympathetic. 



From now on I will use these two terms, sympathetic 

 and parasympathetic, to designate the two antagonistic 

 parts of the vegetative systems. Finally, to complete our 

 studies, we must investigate the grouping and the morpho- 



