SPINAL ACCESSORY NERVE. 



4.53 



Fig. 148.* 



behind the internal jugular vein, and descends obliquely to the upper 

 part of the sterno-mastoid muscle. It pierces the sterno-mastoid, and 



* The anatomy of the side of the neck, shewing the nerves of the tongue. 

 1 . A fragment of the temporal bone containing the meatus auditorius externus, 

 mastoid, and styloid process. 2. The stylo-hyoid muscle. 3. The stylo- 

 glossus. 4. The stylo-pharyngeus. 5. The tongue. 6. The hyo-glossus mus- 

 cle ; its two portions. 7. The genio-hyo-glossus muscle. 8. The genio-hvoi- 

 deus ; they both arise from the inner surface of the symphysis of the lower jaw. 

 9. The sterno-hyoid muscle. 10. The sterno-thyroid. 11. The thyro-hypid, 

 upon which the thyro-hyoidean branch of the hypoglossal nerve is seen ramifying. 

 12. The omo-hyoid crossing the common carotid artery (13), and internal ju- 

 gular vein (14)." 15. The external carotid giving off its branches. 16. The in- 

 ternal carotid 17. The gustatory nerve giving off a branch to the submaxil- 

 lary ganglion (18), and communicating a little further on with the hypoglossal 

 nerve. 1Q. The submaxillary, or Wharton's duct, passing forwards to the 

 sublingual gland. 20. The glosso-pharyngeal nerve, passing in behind the 

 hyo-glossus muscle. 21. The hypoglossal nerve curving around the occipital 

 artery. 22. The descendens noni nerve, forming a loop with (23) the commu- 

 nicans noni, which is seen to be arising by filaments from the upper cervical 

 nerves. 24. The pneumogastric nerve, emerging from between the internal 

 jugular vein and common carotid artery, and entering the chest. 25. The 

 facial nerve, emerging from the stylo-mastoid foramen, and crossing the exter- 

 nal carotid artery. 



