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 cavernosas) lies inferior and internal to the 

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

 branches are: (aa) the carotid branches, {bb) the comnnmicating branch to the oculo- 

 motor nerve, {cc') the communicating branch to the trochlear nerve, {dd) the C07n- 

 mioiicati^ig branch to the ophthabnic division of the trigeminus nerve, {ee) a branch 

 to the ciliary ganglion and {//) branches to the pituitary body. 



Fig. 1132. 



Superior cervical cardiac branch ot sympathetic 



Sympathetic association cord 

 Right \agus nerve 



Middle cervical ganglion 



Inferior cervical ganglion 



Superior cervical cardiac of vagus 



Middle and inf. cervical cardiac^ 

 branches of sympathetic 



Recurrent laryngeal nerve 



Pulmonary branch of vagus 



Vena azygos major 



Phrenic nerve 



Right pulmonary artery 



Pulmonary vein 

 Aorta 



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 



IX 



[of 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 



Pulmonary orifice 



Mesial surface of lung 

 Pericardium 



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

 branches and pulmonary artery 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 the 

 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 



