Georoc L. Streeter 



97 



structure occurs the outgrowth of the central rootlets of the ganglia. On 

 comparing Figs. 1, 9, and 11 one gets the impression of an actual conver- 

 sion of the dorsal bridge into the ganglion rootlets. In Fig. 10 the 

 dorsal rootlets have attained a considerable length, and show a tendency 

 toward anastomosis. 



Vagus root gang 



' Accessor y root gang. 



IX root gang 



N tymp 

 Gang, petros 



Gang, nodes. 

 N-lary(^. sup. 



XII \^ith r descend. 



Sympathetic. 



Vagus 



Froriep 



Fig. 11. Reconstruction of peripheral nerves in Ave weeks human embr3'o, 14.0 mm. lonfr. 

 Mall collection No. 144. Enlarged 16.7 diams. This drawing- is reversed right tor left. 



The eleventh cranial nerve lies median to the dorsal rootlets, and is 

 attached at irregular intervals to the spinal cord, just ventral to their 

 attachments to the cord. It may run either mcsially or laterally to the 

 rootlets of the first spinal ganglion, and is usually adherent to the gang- 

 lion itself. Cell masses are found on the trunk of the nerve in this 



