THE THORAX. 



215 



occupied by the plexuses. The terms superficial and deep cardiac are used for 

 the same reason. The cardiac plexus is formed as follows : 



1. By cervical and thoracic branches of the pneumogastric nerve. 



2. By branches from the recurrent laryngeal nerve. 



3. By branches from the cervical sympathetic nerve. 



to G.ofRoot ofPneunwy. 

 tofetrosal ff.o 

 Glosso-ph, 



G.*GANGLION. 



Cardiac br.fkPneumogastnc p.= PLEXUS. 

 andRtc.Larynyeal Kcrvts A.> ARTERY. 



1.2.3.4. BRAN CHES. 

 FROM PNEUMOGASTHIC 



\ f f-nr i NERVE TOTHECAROIAC 



\G-ofWrisberg 



VuhantoS-PGanglicri 



+ r so *_ LaraeS.Petrosal 



iff u. offnc turwyajtric 



' toffypoyloaaal Jf. 



<r. of Ext. CdroticLA. 



toPha.ryngea.1 P 

 to Inf. Thyroid A . 



Cardiac Plexus 



.Coronary Plexus 



tro-duadenal 



4th.. 



5^ 



from Coayyoal 



5 Sup.Ifemorrhoidal . 

 6 Spermatic Plexus. 



Pelvic P. orlnfflypogastric. 



SUPPLIES ALL THE PELVIC VISCERA AND THE PENIS. 



GangKon Impar. 



Irsffi'tbtters Compmd of Anatomy. 

 FIG. 152. THE SYMPATHETIC SYSTEM OF NERVES. 



Dissection of tlie Posterior Mediastinal Space (Fig. 150). Remember, you are 

 not to remove the heart and lungs in order to dissect the space. Modus oper- 

 andi : (i) Turn the right lung to the left side. This is easily done, provided there 

 are no pleural adhesions. Where adhesions exist, these must be broken up. (2) 

 Separate the parietal pleura from the ribs, at the cut margin of the ribs, and you 



