548 



SriVINIOk L. KOCH 



(Jaskcll (lescrilxMl thv small myeliiuitod fibers in the <;l()ss()- 

 pluiryngeiil nerve as 1.8 to 3.G micra in diameter, the large as 

 not exceeding 10.8 micra. He found that large myelinated fibers 

 were present in all the roots of the accessory nerve, but that the 

 small fibers were confined to the bulbar and upper cervical roots. 

 I^arratt described the IXth nerve as composed chiefly of small 

 myelinated fibers 4 micra in diameter. Kopsch described the 

 IXth nerve as consisting of a motor and sensory portion, and 



Fig. 3 J'rom a section of the accessory nerve <jf tlie clog, showing a bundle 

 of sympathetic fibers joining the nerve. Pyridiiie-silvor. Ocu. 0, Obj. S. 



receiving sympathetic fibers from the superior cervical ganglion. 

 He described the accessory nerve as arising in two parts, the 

 accessorius vagi, which -joined the vagus as the ramus internus; 

 and the accessorius spinalis, which as the ramus externus received 

 fibers from the jugular ganglion of the vagus. Chase and Ran- 

 son found numerous unmyelinated fibers in the roots of the 

 vagus but thought the bulbar rootlets of the accessory nerve 

 contained few if any unmyelinated fibers. Kopsch described 

 the hypoglossal nerve as arising hi 10 to 15 root bundles, and 



