CERVICAL PORTION OF THE SYMPATHEITC SYSTEM!, 517 



"bundle, which gains the origin of the three terminal divisions of 

 the primitive carotid ; and Srd, Small filaments supplying the 

 .guttural pouch and pharynx. 



1. The branches which accompany the carotid, generally two 

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

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

 they form the cavernous 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 s'low the nerves. 1, Heart ; 2, Anterior aorta ; 3, Posterior 

 aorta ; 4 4, Trachea ; 5 5, (Esophag^is ; 6, Seventh, 7, Eighth cervical nerves ; 8, First dorsal 

 nerve ; 9 9, Diaphragm ; a. Point of (.eparation of sympathetic and pneumogastric ; 6, Pneumo- 

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

 Phrenic ; g* g", Its rootc, fron the sir.th and seventh cervicals ; ft, End of cervical portion cf 

 sympathetic cord ; i, Inferior corvical ganglion ; k, First dorsal ganglion -.III, Thorado part of 

 sympathetic cord ; m w, U aicn of sympathetic and dorsal nerves ; n, Continnation of syn^iatlietic : 

 o, Splanchnic. 



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

 it communicates with the ophthalmic ganglion, and also sends a 

 filament to the' Gasserian ganglion, and mingles its fibres with 

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

 of the eye. 



