THE SYMPATHETIC SYSTEM 279 



can say that these nuclei form a continuous column located 

 between the VII VIII cervical segment, above, and the 

 I II lumbar segment below. Above and below, they do 

 not form a column, but leave indications of one in the 

 shape of scattered cells of Sterling Clarke. 



THE PERIPHERAL NERVE FIBRES OF THE VEGE- 

 TATIVE SYSTEM. 



We have seen, when we studied the various elements of 

 the vegetative motor arc, that among these elements, 

 there was a white central ganglionic fibre, whose vegeta- 

 tive cell was intra-axial, and whose axion united the central 

 axial cell with the extra axial ganglionic celL Further- 

 more, we have seen that in the cerebro spinal axis, there 

 exist vegetative cellular groups, divided into several 

 nuclei in the spinal column, more or less regularly placed 

 in a column. We can now trace the bond of union be- 

 tween these two parts and say that the nuclei and columns 

 correspond to the groups of cells which originate the 

 central ganglionic fibres. As a sequel to this the vege- 

 tative central ganglionic fibres emerge from the spinal axis 

 by segmentary nerves which on the whole correspond to the 

 topographic segmentation of the vegetative cellular grouping. 



This is why in the cerebral part, we see arising from the 

 various vegetative motor nuclei, vegetative fibres which, 

 to reach the tissues they supply, follow the course of 

 certain nerves which arise from this part of the nervous 

 axis. From the pupillary nucleus arise vegetative fibres 

 which travel with the III cranial nerve ; from the lacrymal 

 mucus-facial nucleus, fibres annexed to the VTI; from the 

 superior salivary nucleus, fibers annexed to the inter- 

 mediate nerve of WVisberg; from the inferior salivary 

 nucleus, fibres annexed to the IX cranial nerve (glosso- 

 pharyngeal) ; from the nucleus of the vagus, the greater 



