198 



Journal of Comparative Neurology. 



The variation in the relation of these different nerves to 

 the spinal nerves is expressed in the following tables:^ 



TABLE of distribution OF SPINAL NERVES. 



This table gives a summary of the distribution of the ven- 

 tral primary divisions of the various spinal nerves entering the 

 lumbar plexus. " Comm. br. " indicates a proximal communi- 

 cating branch between the given spinal nerve and the next be- 

 low. The percentage sign refers to the ratio of the number of 

 the plexuses in which the given condition is found to the total 

 number of plexuses (122). The names of the various peripheral 

 nerves indicate direct origin from the given spinal nerve. 

 "Types of distribution " refers to the various distinct modes by 

 which the constituent elements of the spinal nerve have been 

 found distributed. 



1 These statistics are based upon a study of but a part of the tabulation 

 charts. They are based upon the conditions found in sixty-one bodies, or i:;2 

 lumbar plexuses. It is probable that when all of the charts have been examined 

 the figures given will need some alteration, as expressive of the lumbar plexus. 

 The tables, extended so as to include tabulations from a greater number of 

 charts, will appear in a more extended article on the lumbo-sacral plexus, in 

 the preparation of which Dr. A. W. Elting and myself are at present engaged. 



