THE SYMPATHETIC SYSTEM OF NERVES. 



1361 



to furnishing twigs to the mucous membrane of the middle ear and vicinity, this plexus con- 

 tributes a large part of the small superficial petrosal nerve, which joins the otic ganglion as its 

 sensory root (page 1246). 



The cavernous plexus (plexus cavernosus) lies inferior and internal to the 

 internal carotid artery and in intimate relation with the cavernous sinus. Its 

 branches are: (aa) the carotid branches, (66) the communicating branch to the oculo- 

 motor nerve, (cc~) the communicating branch to the trochlear nerve, (dd") the com- 

 municating branch to the ophthalmic division of the trigeminus nerve, {ee) a branch 

 to the ciliary ganglion and {ff) branches to the pitidtary body. 



FIG. 1132. 



Superior cervical cardiac branch ot sympathet 



Sympathetic association cord 

 Right vagus m 



Middle cervical ganglion 



Inferior cervical ganglion 



luperior cervical cardiac of vagus 



fiddle and inf. cervical cardiac 

 branches of sympathetic 



Re 



nt la 



al nerve 



Pulmonary branch of vagus 



Vena azygos major 

 Phrenic nerve 



Right pulmonary artery 



Right auricular appendix 

 Pericardium 



Superior cervical cardiac branch 



of sympathetic 



Superior cervical cardiac branch of vagus 

 Middle cervical ganglion 

 Middle cervical cardiac branch 



of sympathetic 



fof sympathetic 

 Inf. cervical cardiac branch 

 Inf. cervical ganglion 



Middle cervical cardiac 



branch of vagus 

 Inf. cervical cardiac 



branch of vagus 

 Phrenic nerve 



Left vagus nerve 

 Recurrent laryngeal nerve 



Left pulmonary artery 

 Pulmonary veins 



Pul .mnary orifice 



Mesial surface of lung 

 Pericardium 



\ 



Dissection showing cardiac branches of pneumogastric nerves and of sympathetic cords; aortic arch and 

 branches and pulmonary arlery partially removed ; pericardium laid open. 



aa. The carotid branches are distributed to the internal carotid artery. 



bb. The communicating branch to the oculomotor nerve joins the latter about at the point 

 where it breaks up into its superior and inferior divisions. 



cc. The communicating branch to the trochlear nerve, sometimes derived from the 

 carotid plexus, joins the trochlear in the wall of the cavernous sinus. 



dd. The communicating branch to the ophthalmic division of the trigeminus nerve joins 

 the mesial surface of that nerve. 



ee The branch to the ciliary ganglion (radices sympatheticae g. ciliaris) arises in tl 

 cranium and enters the orbit through the sphenoidal fissure, either as an independent structure 

 or jointly with the nasal or with the oculomotor nerve. As the sympathetic root (radix media;, 

 it enters the upper posterior angle of the ciliary ganglion (Fig. 1058), either alone or as a 

 common trunk with the sensory root. 



86 



