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TEXT-BOOK OF PHYSIOLOGY. 



of the alimentary canal and its diverticulum, the lung as well as the heart and 

 gastric glands. 



Communicating Branches. At or near the ganglia the vagus receives 

 communicating branches from the eleventh nerve, the spinal accessory, the 

 facial, the hypoglossal, and the anterior branches of the two upper cervical 

 nerves. Owing to this manifold origin of the efferent fibers in the trunk and 



FIG. 280. DISTRIBUTION OF THE PNEUMOGASTRIC. i. Trunk of the left pneumogastric. 

 2. Ganglion of the trunk. 3. Anastomosis with the spinal accessory. 4. Anastomosis with the 

 sublingual. 5. Pharyngeal branch (the auricular branch is not shown in the figure). 6. Superior 

 laryngeal branch. 7. External laryngeal nerve. 8. Laryngeal plexus. 9, 9. Inferior laryngeal 

 branch. 10. Cervical cardiac branch, u. Thoracic cardiac branch. 12, 13. Pulmonary 

 branches. 14. Lingual branch of the fifth. 15. Lower portion of the sublingual. 16. Glosso- 

 pharyngeal. 17. Spinal acessory. 18, 19, 20. Spinal nerves. 21. Phrenic nerve. 22, 23. 

 Spinal nerves. 24, 25, 26, 27, 28, 29, 30. Sympathetic ganglia. (Hirschfeld.} 



peripheral branches of the vagus, it is, in some instances, difficult, if not 

 impossible, to determine to which of these nerves a given muscle contraction 

 is to be referred. 



Vagal Branches. As the vagus passes down the neck it gives off the 

 following main branches (Fig. 280) : 



