348 " ABRAM T. KERR 



the plexus separately instead of by a common stem. In 6 of the 

 above both branches arise from the caudal trunk and in 5 

 of them one branch anastomoses with the intercostobrachial. 

 In one of them, one branch receives a branch from the medial 

 antibrachial cutaneous (fig. 10.) ; in another case a branch of one 

 of the nerves joins the medial antibrachial cutaneous (fig. 5); 

 and in a third plexus one branch communicates with the radial 

 nerve. In one of these plexuses one of the branches arises in 

 common with the medial anterior thoracic nerve. In 8 other 

 cases where there are 2 branches, one of them arises from the 

 caudal trunk and this branch anastomoses with the intercosto- 

 brachial nerve. It arises in common with the medial anterior 

 thoracic in 2 instances. In 7 of the above the second branch 

 arises from the medial fasciculus of the plexus and this does not 

 anastomose in 5 but communicates with the intercostobrachial 

 in 2 instances and also with the medial antibrachial cutaneous 

 in one of them. Another of the above sends a branch to the 

 posterior fasciculus of the plexus. In one of the above 7 cases 

 the nerve arises from a stem common to it and the medial ante- 

 rior thoracic (fig. 11); another from a stem in common with the 

 medial antibrachial cutaneous nerve. 



In 12 cases both of the branches arise from the medial fas- 

 ciculus. In 7 of these they both arise directly from the medial 

 fasciculus and in 4 neither branch anastomoses but in 2 one 

 branch and in one both branches anastomose with the inter- 

 costobrachial nerve. Of the remaining 5 cases, in 4 one branch 

 arises directly from the medial fasciculus and anastomoses with 

 the intercostobrachial but the second branch arises from the 

 medial fasciculus in common with the medial antibrachial cuta- 

 neous in one (fig. 20), with the medial anterior thoracic in one, 

 with both of these nerves in one. In the fourth case both 

 branches arise from the medial fasciculus of the plexus; one with 

 the medial antibrachial cutaneous; one with the medial anterior 

 thoracic. In the fifth instance, both branches arise from the 

 medial fasciculus by a common stem with the medial antibrachial 

 cutaneous. 



In one instance one branch is from the medial fasciculus and 



