620 



THE CRANIAL NERVES. 



then passes behind the root of the left lung, and, emerging from the 

 posterior pulmonary plexus, is distributed like its fellow to the oesophagus. 



Fig. 417. 



Fig. 417. VIEW OP THE NERVES OP THE EIGHTH PAIR, THEIR DISTRIBUTION AND 

 CONNECTIONS ON THE LEFT SIDE (from Sappey after Hirschfeld and Leveilld). 3 



1, pneumo-gastric nerve in the neck ; 2, ganglion of its trunk ; 3, its union with the 

 spinal accessory ; 4, its union with the hypoglossal ; 5, pharyngeal branch ; 6, superior 

 laryngeal nerve ; 7, external laryngeal ; 8, laryngeal plexus ; 9, inferior or recur- 

 rent laryngeal ; 10, superior cardiac branch; 11, middle cardiac; 12, plexiform part 

 of the nerve in the thorax; 13, posterior pulmonary plexus ; 14, lingual or gustatory 

 nerve of the inferior maxillary ; 15, hypoglossal, passing into the muscles of the tongue, 

 giving its thyro-hyoid branch, and uniting with twigs of the lingual ; 16, glosso-pharyngeal 

 nerve; 17, spinal accessory nerve, uniting by its inner branch with the pneumo-gastric, 

 and by its outer, passing into the sterno-mastoid muscle ; 18, second cervical nerve ; 19, 

 third; 20, fourth; 21, origin of the phrenic nerve; 22, 23, fifth, sixth, seventh, and 

 eighth cervical nerves, forming with the first dorsal the brachial plexus ; 24, superior 

 cervical ganglion of the sympathetic ; 25, middle cervical ganglion ; 26, inferior cervical 

 ganglion united with the first dorsal ganglion; 27, 28, 29, 30, second, third, fourth, and 

 fifth dorsal ganglia. 



