THE NERVOUS SYSTEM 



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has many points of interest; it gives off a great many 

 nerves to important structures, and is both motor and 



FlG. 113. Distribution and connection of pneumogastric nerve of left 

 side in neck and upper part of thorax: i, Pneumognstric nerve; 2, gan- 

 glion of its trunk ; 3, accessory part of spinal accessory ; 4. union of pneumo- 

 gastric with hypoglossal ; 5, pharyngeal branch of pneumogastric ; 6, supe- 

 rior laryngeal ; 7, external laryngeal ; 8, communication of external laryn- 

 geal with superior cardiac branch of sympathetic ; 9, inferior or recurrent 

 laryngeal; 10, superior, and n, inferior, cervical cardiic branches; 12, 13, 

 posterior pulmonary plexus; 14, lingual branch of inferior maxillary; 15, 

 distal part of hypoglossal nerve ; 16, glossopharyngeal nerve ; 17, spinal 

 accessory nerve ; 18, second cervical nerve ; 19, third ; 20, fourth ; 21, origin 

 of phrenic nerve; 22,23, fifth, sixth, seventh, and eighth cervical nerves, 

 forming with the first dorsal the brachial plexus; 24, superior cervical gan- 

 glion of sympathetic ; 25, middle cervical ganglion ; 26, inferior cervical gan 

 glion; 27, 28, 29, 30, second, third, fourth and fifth dorsal ganglia. 



sensory. It arises from the floor of the fourth ventricle, 

 passes through the jugular foramen, and presents two gan- 



