1070 



THE NERVE SYSTEM 



and the abducent nerves, and with the ciliary or lenticular ganglion, and distri- 

 butes filaments to the wall of the internal carotid artery, and to the hypophysis. 

 The branch of communication with the oculomotor nerve joins it at its point of 

 division; the branch to the trochlear nerve joins it as it lies on the outer wall of 

 the cavernous sinus; other filaments are connected with the under surface of the 

 trunk of the ophthalmic nerve; and a second filament of communication joins the 

 abducent nerve. 



EXTERNAL 

 RECTUS 

 MUSCLE 



SENSORY ROOT 

 OF CILIARY 

 GANGLION 



OPHTHALMIC N. 



GASSERIAN 

 GANGLION 



(turned forward) 



GREAT DEEP 

 PETROSAL N 



TEMPOHO- 



MAXILLARY 



ARTICULATION 



SMALL DEEP 

 PETROSAL N 



INFERIOR 

 CAROTICOTYMPAN:C N, 



MOTOR ROOT OF 



CILIARY GANGLION 



UPPER BRANCH 



OF OCULOMOTOR 



LOWER BRANCH 



OF OCULOMOTOR 



SYMPATHETIC ROOT OF 

 CILIARY GANGLION 



OCULOMOTOR NERVE 



OPHTHALMIC 

 ARTERY 



HYPOPHYSIS 



CAVERNOUS 

 PLEXUS 



ABDUCENT NERVE 



COMMUNICATING 



BRANCH TO ABDUCENT NERVE 



INTERNAL 



CAROTID 



ARTERY 



INTERNAL 



CAROTID PLEXUS 

 INTERNAL 

 CAROTID BRANCH 

 OF SUPERIOR 

 CERVICAL GANGLION 

 SUPERIOR 

 CERV CAL 

 GANGLION 



FIG. 781. The cephalic portion of the sympathetic nerve system, seen obliquely from above and 



behind. (Toldt.) 



The filaments of connection with the ciliary ganglion (Fig. 730) arise from the 

 anterior part of the cavernous plexus and enter the orbit through the sphenoidal 

 fissure; they may join the nasal branch of the ophthalmic nerve or be continued 

 forward as a separate branch. 



The terminal filaments from the carotid and cavernous plexuses are prolonged 

 along the internal carotid artery, forming plexuses which entwine around the 

 anterior and middle cerebral arteries and the ophthalmic artery; along the former 

 vessels they may be traced on to the pia; along the latter, into the orbit, where they 

 accompany each of the branches of the vessel. The filaments prolonged to the 

 anterior communicating artery connect the sympathetic nerves of the right and 

 left sides. 



The so-called inferior branch of the superior cervical ganglion communicates 

 with the middle cervical ganglion. 



The external branches are communicating, and consist of gray rami communi- 

 cantes to the upper four cervical nerves and to certain of the cranial nerves. 

 Sometimes the branch to the fourth cervical nerve may come from the cord 

 connecting the superior and middle cervical ganglia. The branches to the cranial 

 nerves consist of delicate filaments, which run to the ganglion of the trunk of 



