832 



THE NERVOUS SYSTEM 



motor fibres, and secretory fibres to the lower limb, some vaso-constrictor fibres to 

 the abdominal blood-vessels, motor fibres to the circular, and inhibitory fibres to 

 the longitudinal muscle of the rectum: the latter enter the sympathetic cord by the 

 lower dorsal nerves, thev pass by the lumbar efferentes to the aortic plexus and 

 terminate round the cells of the inferior mesenteric ganglion. 



The fibres which pass through the dorsal ganglia to the splanchnic nerves are 



GANGLION OF 

 POSTERIOR 

 NERVE ROOT 



POSTERIOR 

 PRIMARY 

 DIVISION 



ANTERIOR 

 PRIMARY 

 DIVISION 



VASO-MOTOR, J. 



PILO-MOTOR AND — ^• 

 SECRETORY FIBRES 



Fig. 4 70 a. 

 VASO-MOTOR RECURRENT NERVE 



ANTERIOR NERVE ROOT 



SY2IPA TIIETIC CORD 



- SYMPATHETIC GANGLION 



RAMUS EFFERENS 



SYMPATHETIC CORD 



WHITE RAMUS 

 COMMUNICANS 



GREY RAMUS 

 COMMUNICANS 



SYMPA THETIC CORD 



RAMUS EFFERENS 



PERIPHE- 

 RAL 



GAN- 

 GLION 



PERIPHERAL ORGAN 



mainly vaso-motor fibres to the abdominal blood-vessels, the majority of them 

 probably terminate around the cells of the ganglia in the solar plexus, but those 

 for the renal blood-vessels are said to end in the renal ganglia. In addition to all 

 the above-mentioned fibres there are, in the dorsal part of the sympathetic cord 

 afferent (splanchnic sensory) fibres, passing towards the posterior roots of the 

 dorsal nerves. 



