500 GLOSSO-PHARYNGEAL. 



which arise separately, but unite and form another cord, the 

 proper Par Vagum. Associated with these is a third cord, 

 called the Spinal or Accessory Nerve of Willis, which origi- 

 nates in the great canal of the spine, and, passing up into the 

 cavity of the cranium, goes out of it with these nerves through 

 the foramen lacerum. 



The two first mentioned nerves proceed from their origin to 

 the posterior foramen lacemm, and pass through it with the 

 Internal Jugular vein, being separated from the vein by a 

 small process of bone. They are also separated from each 

 other by a small process of the dura mater. In the foramen 

 they are very close to each other; but soon after they have 

 passed through it, they separate and proceed towards their 

 different destinations. 



The Glosso-Pharyngeal proceeds towards the tongue, be- 

 tween the stylo-pharyngeus and the stylo-glossus muscles, fol- 

 lowing the course of the last mentioned muscle to the posterior 

 part of the tongue. At the commencement of its course it 

 receives a twig from the Portio Dura, and one also from the 

 Par Vagum. It soon gives off a branch which passes down 

 on the inside of the common carotid to the lower part of the 

 neck, where it joins some twigs of the intercostal to form the 

 cardiac nerves. Afterwards it sends off several twigs to the 

 muscles of the pharynx and its internal membrane, and also 

 some twigs which unite with others from the upper cervical 

 ganglion of the Sympathetic, and form a network that lies 

 over the anterior branches of the external carotid. The Glosso- 

 Pharyngeal finally enters the tongue, at the termination of 

 the hyo-glossus muscle; and after sending branches to the 

 lingualis, and the various muscles inserted into the tongue, 

 terminates in small ramifications that are spent upon the sides 

 and middle of the root of the tongue, and upon the large pa- 

 pilla?. 



It sends off likewise two or three filaments to supply the 

 stylo-pharyngeus muscle, and tonsillitic branches which form- 

 ing a circular plexus round the base of the tonsil gland 

 communicate with the posterior palatine nerves that come off 



