142 



Cranial Nerves. 



R. AURIC. VAGI 



IX. N. OLOSSO- 



*VH. N. FACIALIS 



R. M. STYLO - 

 PHARYNG-. 



BANGL. SYMR SUP. 



H.LARYNff. SUP. VAGI 



GANGL. SYMP. MED. 



H. CARD. SUPER. SYMP. 



N. LARYNO. 

 REGURR. VAGI 



Trachea, 



480. The Grlosso-Pharyngeal, Pneumogastric and 



HypOgloSSal Nerves. From behind. 



2. The thoracic portion of the vagus lies at first to the outer side 

 of the common carotid artery; on the right side it crosses over the right sub- 

 claviau artery, on the left side over the arch of the aorta ; each nerve then 

 passes behind the root of each lung, the right vagus passing behind the oeso- 

 phagus, the left in front of it. The branches are : 



a) I n f e r i o r or recurrent 1 a r y n g e a 1, Nervus laryngeus recurrens. 

 The right (shorter) winds around the right subclaviau artery, the left (longer) 

 around the arch of the aorta; both nerves ascend in the groove between the 

 trachea and oesophagus to the larynx, and supply its muscles. 



b) Anterior and posterior pulmonary or bronchial, Nervi 

 broncJtiales anteriores et posteriores . The former form with the cardiac nerves of 

 the sympathetic the anterior pulmonary plexus, Plexus bronchialis anterior, 

 the latter with branches of the thoracic ganglia of the sympathetic the posterior 

 pulmonary plexus, Plexus bronchialis posterior; they are distributed to the 

 anterior and posterior aspects of the root of the lung. 



c) Oesophageal plexus, Plexus oesopliayeus, at the anterior and 

 posterior aspects of the oesophagus. 



3. The abdominal portion of the vagus is formed by the twigs 

 leaving the oesophageal plexus, which, by their communication, form the anterior 

 and posterior gastric plexus, Plexus gastricns anterior et posterior, at 

 the anterior and posterior aspects of the stomach; the former communicates 

 with the hepatic plexus, the latter with the coeliac plexus, it sending filaments 

 to the spleen, pancreas, small intestines and kidney. 



