.);)2 SUMNKK L. KOCH 



some of whicli outer the nerve sheath and travel distalward with 

 the myelinated fibers. 



4. The accessory and hypoglossal nerves are composed of 

 large and small myelinated fibers, and are similar in appearance 

 and structure to the Ilird and IVth nerves. Like the Vlth 

 nerve, they receive considerable numbers of unmyelinated fibers 

 from the sympathetic system which can be followed to the ter- 

 mination of the nerves in the muscles which they supply. 



LITERATURE CITED 



Bakhatt, J. O. W. 1899 Observations on the normal anatomy of the 9th, 10th, 

 nth, and 12th cranial nerves. Arch, of Neur. from the Path. Lab. of 

 the London County Asylums, vol. 1, p. 537. 



1899 On the anatomical structure of the 9th, 10th, 11th, and 12th 

 cranial nerves. Brit. Med. Jour. 1899, part II, p. 837. 

 1901 Observations on the structure of the third, fourth, and sixth 

 cranial nerves. Jour. Anat. and Phys., vol. 35, n. s. 15, p. 214. 



BouGHTON, T. H. 1906 The increase in the number and size of the medullated 

 fibers in the oculomotor nerve of the white rat and of the cat at differ- 

 ent ages. Jour. Comp. Neur., vol. 16, p. 153. 



CARPENTER, F. W. 1906 The development of the oculomotor nerve, the ciliary 

 ganglion and the abducent nerve of the chick. Bull. Mus. Comp. 

 Zool. Harv. Coll., vol. 48, no. 2. 



Chase, M. R. and Ranson, S. W. 1914 The structure of the roots, trunk, and 

 branches of the vagus nerve. Jour. Comp. Neur., vol. 24, p. 31. 



Gaskell, W. H. 1889 On the relation between the structure, function, dis- 

 tribution and origin of the cranial nerves; together with a theory of 

 the origin of the nervous system of vertebrates. Jour. Phys., London, 

 vol. 10, p. 153. 



KopscH, Fr. Rauber's Lehrbuch der Anatomie des Menschens, Abt 5, Leipzig. 



Ranson, S. W. 1911 Non-medullated fibers in the spinal nerves. Am. Jour. 

 Anat., vol. 12, p. 67. 



1912 The structure of the spinal ganglia and of the spinal nerves. 

 Jour. Comp. Neur., vol. 22, p. 159. 



