SYMPATHETIC NERVES OF HYRAX CAPENSIS. 155 



the aortic plexus ( A.P), vewa azygos majof (Az.ISr), thoracic nerves, 

 and left sympathetic. 



In the abdomen the mesial division divides into two, and the 

 following are the fibres of distribution : — 



1. To the cfpliac ganolion (A). 



2. Hepatic plexus (contained in A). 



3. Phrenic plexus (contained in A). 



4. Fibres to the right renal plexus (E-.R.P). 



5. Fibres to Meckel's Tract and Duodenum (M.B). 



6. Fibres to the colon (C.B). 



The abdominal part lies close to the left sympathetic and fibres 

 connect them. It gives ofi' the right renal plexus (R.R.P), right 

 spermatic plexus (R.S.P). and filaments to the aortic plexus. 



The Cardiac Plexus consists almost entirely of the deep part, 

 the superficial plexus consisting only of a few filaments derived 

 from it. The nerves entering into it are : — 



1. Three branches of the left vagus. 



2. A twig from the left recurrent nerve. 



3. A branch from the inferior cervical ganglion of the left 

 sympathetic. 



4. Two blanches from the right recurrent nerve. 



5. Two bi-anches from the right vagus. 



No ganglia are present, nor are there separate depressor nerves ; 

 but these may be contained in the loops uniting the superior and 

 recurrent laryngeal nerves. Ofi'shoots of the plexus can be traced 

 into the pulmonary and ti-acheal plexuses. 



The Aortic Plexus (A.P) derives its fibres from the two sympa- 

 thetic cords, the'bridge between the vagi in the thorax, and the 

 solar plexus. 



The Solar Plexus (text-fig. 7) : — In the upper jjart of the 

 abdomen dorsad of the stomach there is a, broad band of fibres 

 with a large reddish-brown semilunar ganglion at its left 

 extremity. The fibres are closely packed and have wide con- 

 nections as follows : — 



1. The splanchnic nerves from the left sympathetic cord 

 entering the anterior pole of the ganglion (A). 



2. Two bundles of fibres from the left sympathetic cord 

 entering the mesial border of the ganglion (B). 



3. Fibres from the right vagus to the large left splanchnic 

 nerve (C). 



4. Fibres from the right vagus to the semilunar ganglion (D). 



5. Fibres from the left vagus to the semilunar ganglion (E). 



6. Fibres from the right vagus running into the plexus and 

 turning down to the splenic plexus (F). 



7. Fibres from the semilunar ganglion to the splenic plexus (G). 



8. Branches from the solar to the splenic plexus (H). 



9. Branches from the right sympathetic to the semilunar 

 ganglion (I). 



lb. Hepatic plexus (J) giving off pyloro-duodenal nerves (K). 

 11. Diaphragmatic plexus (L). 



