Roth, Spinal Accessory Nerve. 493 



plexus, and that it ceases at about the level of the beginning 

 of the lumbo-sacral plexus, has suggested its dependence in 

 some way upon the plexuses, a view which has been especially 

 emphasized by Harman with reference to the upper limits of 

 the outflow. The exact significance of the interdependence 

 remains, however, obscure ; but granting its existence, it still 

 leaves room for the significance which has been assigned above 

 to the upper outflow, and it would seem that there are two fac- 

 tors influencing the occurrence of white rami fibers in the cer- 

 vical region, one of which is the development of the spinal 

 accessory nerve, while the other is associated with the develop- 

 ment of the brachial plexus. J. Playfair McMurrich. 



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