THE SYMPATHETIC SYSTEM 277 



(6) Juxta pre tuber an tial nucleus located dorsally to the 

 preceding one. It is the superior salivary nucleus. 



(c) The superior bulbar nucleus, located in the neigh- 

 borhood of the motor nucleus of the glossopharyngeal 

 (IX cranial nerve) ; this is the inferior salivary nucleus. 



(d) Middle bulbar nucleus, located between the motor 

 nucleus of the vagus and its sensory nucleus (solitary 

 nucleus). This is the dorsal nucleus of the vagus or 

 vegetative motor nucleus of the vagus; to the vegetative 

 nucleus of the vagus we must also add: 



(e) The vegetative bulbar nucleus of the XI cranial 

 nerve, and its medullary vegetative nucleus, for this 

 nucleus brings to the vagus vegetative fibres. Finally, 

 we must describe : 



(/) A vegetative bulbar nucleus, probably of the hypo- 

 glossal (XII cranial) : 



It is believed by some that there exist also one or more 

 vegetative nuclei annexed to the V nerve. In reality, 

 in spite of the fact that this is not settled, it probably is 

 not so; for we shall see that the vegetative fibres which 

 follow the V, only follow it part of the way and cannot be 

 attached to the nerve, as was the case of the preceding 

 vegetative nucleus. 



B. CELLULAR GROUPING IN THE SPINE. 



We must study separately : the cellular groups derived 

 from the intermediate lateral part of the anterior horn and 

 the groups derived from the medial ventral part of this 

 same horn. 



(a) Groups derived from the intermediate lateral zone. 



They are found in three parts of the cord. 



Cervical region (from the I to the IV segment inclusive). 



Thoracic-lumbar region (from the I dorsal segment 

 inclusive to the III, or IV lumbar segment). 



