THE SYMPATHETIC SYSTEM OF NERVES. 



1363 



i. The vertebral plexus (plexus vertebralis) is a closely woven net-work of 

 fibres which follows the course and distribution of the vertebral artery in the neck 

 and cranium. 



FIG. 1133. 



I. rib 



II. thoracic nerve 

 Intercostal artery 

 IIL thoracic nerve 



Intercostal artery 

 V. thoracic nerve 



XI. thoracic ganglion ; immedi- 

 ately below it is the XII. 



Ilio-hypogastric 



nerve 

 II. and III. lumbar 



ganglia, fused 

 Ilio-inguinal nerve 



IV. lumbar 

 ganglion 



IV. lumoar nerve 

 V. lumbar ganglion 



Interganglionic 

 association cord 



I. sacral ganglion 



Anterior crural nerve 

 II. sacral ganglion 



III. sacral nerve 

 IV. sacral ganglion 



XII. rib 



Diaphragm 



I. lumbar ganglion 



I. thoracic ganglion partially 



blended with inferior 

 cervical ganglion 



II. thoracic ganglion 



Aorta 



Great splanchnic nerve 



Small splanchnic nerve 

 Least splanchnic nerve 



Semilunar ganglion and 

 solar plexus 



Dissection showing thoracic, lumbar and sacral portions of right gangliated cord and their branches. 



2. The inferior cervical cardiac nerve (n. cardiacus inferior) (Fig. 1132), 

 sometimes arising from the first thoracic ganglion, descends in the thorax posterior to 



