THE SYMPATHETIC SYSTEM 291 



roots of the maxillary ganglion; ganglion-organic neuron 



from the cells of the two ganglia to the glandular tissue. 



The sensory arc is represented by the inferior maxillary, 



the trigeminal, the sensory roots of the intermediary 



nerve of Wrisberg. 



D. PHYSIOLOGY OF THE VEGETATIVE SYSTEM ANNEXED 

 TO THE IX CRANIAL. 



The vegetative fibres arising from the inferior salivary 

 nucleus travel with the fibres of the IX in that part of the 

 nerve between the central axis and the ganglion of Andersch. 



Here the fibres follow one of the branches of the IX, 

 the nerve of Jacobson and finally reach the optic gang- 

 lion, or ganglion of Arnold where they end and anasto- 

 mose with the ganglionic cells. From these cells arise new 

 neurons which follow the auriculo-temporal nerve and 

 reach the parotid gland. These fibres control the secre- 

 tions of these glands. 



The motor arc is therefore as follows: central gangli- 

 onic neuron from the inferior salivary nucleus to the 

 optic ganglion passing by the IX nerve, Jacobson's 

 nerve, the deep petrosal nerve, ganglion-organic neuron 

 from the optic ganglion to the gland, passing by way of the 

 auriculo-temporal . 



The sensory arc is represented by the sensory part of 

 the trigeminal and by the sensory tracts of the glosso 

 pharyngeal and the intermediary nerve. 



E. PHYSIOLOGY OF THE VEGETATIVE SYSTEM ANNEXED TO THE 



x CRANIAL (VEGETATIVE VAGUS) 



If we leave out a small area which is related to motor 

 life of the voluntary system (pharynx, soft palate and 

 larynx), we must consider the vagus as the chief nerve of 

 the vegetative system. This nerve controls the excito- 

 motor stimulation for: 1. The gastro intestinal tract 



