THE SYMPATHETIC SYSTEM OF NERVES. 



The diaphragmatic or phrenic plexus (plexus phrenicus) is derived from the 

 upper portion of the semilunar ganglion and accompanies the phrenic branch of the 

 abdominal aorta to the diaphragm, the right being larger than the left. After 

 supplying some filaments to the suprarenal body, it enters the musculature of the 

 diaphragm and there unites with the phrenic nerve from the cervical spinal plexus. 

 At the point of inosculation, on the right side only, near the suprarenal body and on 

 the under surface of the diaphragm, is a small ganglion called the phrenic ganglion 

 (g. phrenicura). From it are given off branches to the suprarenal body, the inferior 

 vena cava aud the hepatic plexus. 



The suprarenal plexus (plexus suprarenalis) arises from the lateral aspect of 

 the semilunar ganglion and is joined by filaments from the diaphragmatic and renal 



FIG. 1138. 



inferior 



surface 



Gastro-epiploica 

 dextrawith plexus 



Pyloric artery 

 with plexus 



Castro-duodenal 



artery with plexus 



Hepatic artery 



with plexus 



Inf. pancreatico- 



duodenal artery 



Sup. pancreatico- 



duodenal artery 



Pancreas, 

 Sup. mesenteri' 

 artery with plexu 



Stomach, 

 turned up 



4 Gastro-epiploica 

 sinistra with plexus 



Right vagus nerve 



Gastric artery 

 'with plexus 

 .Splenic artery 

 ith plexus 



Spleen 



Dissection showing gastric, hepatic and splenic plexuses; stomach has been turned up and part of pancreas removed. 



plexuses. It consists mainly of medullated fibres and, while very short, is made up 

 of a number of filaments and is of considerable size. Numerous tiny ganglia are 

 scattered throughout the meshes of this plexus. 



The renal plexus (plexus renalis) is derived mainly from the aortico-renal 

 ganglion, additional fibres being contributed by the smallest splanchnic nerve, some- 

 times by the small splanchnic, and by the aortic and suprarenal plexuses ; there is 

 occasionally present a twig from the first lumbar ganglion. Entering the hilum of 

 the kidney with the renal artery, the plexus splits up and ramifies in the renal sub- 

 stance. In its course along the artery a number of ganglia of varying size, called 

 the renal ganglia, are found. In addition to supplying the kidney, filaments are 

 furnished to the spermatic plexus and to the ureter, and on the right side to the 

 inferior vena cava. 



