CERVICAL POETION OF THE SYMPATHETIC SYSTEM, 517 



Ibundle, which gains the origiQ of the three terminal divisions of 

 the primitive carotid ; and 3rd, S m al l filaments supplying the 

 guttural pouch and pharynx. 



1. The branches which accompany the carotid, generally two 

 in number, the anterior being largest, wind round the artery, and 

 anastomose one with the other. Extending to the cavernous sinus, 

 they form the cavemoiis plexus, by which they communicate with 

 many of the cranial nerves, and send filaments to join analogous 

 filaments from the opposite side. A branch from this plexus joins 

 the superficial petrosal nerve, and contributes to the formation 

 of the Vidian nerve, which joins the spheno-palatine ganglion. 



Fig. 195. 



Thorax opened from tbe left side to ahow the nerves. 1, Heart ; 2, Anterior aorta ; 8, Posterior 

 aorta ; 4 4, Trachea ; 5 5, CEsophagns ; 6, Seventh, 7, Eighth cervical nerves ; 8, First dorsal 

 nerve ; 9 9, Diaphragm ; a, Point of separation of sympathetic and pneumogastric ; 6, Pneumo- 

 gastric ; c c, Recurrent : d, Cerd'ac ; e, Superior, /, Inferior branch of the pneumogastric : g g g. 

 Phrenic ; g' g", Its rootr^ from the sijith and seventh cervicala ; h, End of cervical portion of 

 sympathetic cord ; i, Inferior corvical ganglion ; fc, First dorsal ganglion : II I, Thoracic part of 

 sympathetic cord ; mw, U^ca of sympathetic and dorsal nerves ; n, Continnation of aympathetio :' 

 0, Splanchnic. 



In company with fibres from the ophthalmic branch of the fifth, 

 it communicates with the ophthalmic ganglion, and also sends a 

 filament to the Grasserian ganglion, and mingles its fibres with 

 those of the third, fourth, and sixth cranial nerves, or motor nervea 

 of the eye. 



