504 



SPINAL ACCESSORY. 



210.* orly. Each of these nerves forms 



a plexus known -as the cesophageal, 

 which nearly surrounds the oesopha- 

 gus, as they descend on it ; but 

 the network is thickest on the pos- 

 terior side. They pass through the 

 ^diaphragm with the oesophagus, 

 and unite again so as to form con- 

 siderable trunks. These terminal 

 branches of the nerve are called the 

 gastric. 



The Anterior, which is the small- 

 est, proceeds along the lesser curva- 

 ture of the stomach to the pylorus. 

 Some of its fibres are spread upon 

 the anterior side of the stomach and 

 the lesser omentum. Others of 

 them extend to the left hepatic, and 

 also to the solar plexus. 



The Posterior trunk sends 

 branches to surround the cardiac 

 orifice of the stomach. Many 

 branches are spread upon the under 

 side of the great curvature of the 

 stomach. Some of them pass in 

 the course of the coronary artery to 

 the cceliac, and unite to the hepatic 

 and splenic plexus ; and one trunk, 

 which is thick, although short, pro- 

 ceeds to the solar plexus. 



The Accessory Nerve of Willis, 



Which has been mentioned as associated with the eighth 

 pair of nerves, within the cranium, has a very peculiar origin. 



* Origin and distribution of the eighth pair of nerves. 1, 3, 4. The medulla 

 oblongata. 1. Is the corpus pyramidale of one side. 3. The corpus olivare. 

 4. The corpus restiforme. 2. The pons Varolii. 5. The facial nerve. 6. The 

 origin of the glosso-pharyngeal nerve. 7. The ganglion of Andersch. 8. The 

 trunk of the nerve. 9. The spinal accessory nerve. 10. The ganglion of the 

 pneumogastric nerve. 11. Its plexiform ganglion. 12. Its trunk. 13. Its 



