BRACHIAL PLEXUS OF NERVES IN MAN ' 347 



there is no anastomosis with the intercostobrachial (fig. 21). 

 One of the 23 sends a branch to the medial antibrachial cutaneous 

 and in 2 others there is an anastomosing branch from the medial 

 antibrachial cutaneous to the intercostobrachial nerve. In the 

 remaining 33 cases where the nerv.e arises directly it anastomoses 

 with the intercostobrachial (fig. 18). In one of these it arises 

 by 2 heads (fig. 8), in another it sends a branch to the posterior 

 division of the caudal trunk. In 3 of the above, the medial 

 antibrachial cutaneous also anastomoses with the intercosto- 

 brachial nerve. 



There are 25 instances in which the medial brachial cutaneous 

 nerve arises from the medial fasciculus of the plexus in combina- 

 tion with some other nerve. In 16 of these, it is in common 

 with the medial antibrachial cutaneous (fig. 15) and in 8 of these 

 it anastomoses with the intercostobrachial In 3 of the above 25 

 cases, the medial brachial cutaneous is combined with the medial 

 anterior thoracic nerve (fig. 14). In 6 instances it arises from a 

 branch common to it and the medial antibrachial cutaneous and 

 the medial anterior thoracic nerve (fig. 17), and in 3 of these it 

 anastomoses with the intercostobrachial nerve. 



There are 2 instances in which the medial brachial cutaneous 

 nerve arises directly from the dorsal division of the caudal trunk 

 and in one of these it anastomoses with the intercostobrachial 

 nerve (fig. 7). 



There are 4 plexuses in which it arises singly from the ulnar 

 nerve and in one of these it anastomoses with the intercosto- 

 brachial. 



In 6 instances there is a single medial brachial cutaneous 

 nerve arising directly from the first thoracic nerve and in 5 of 

 these it anastomoses with the intercostobrachial. In one case 

 it arises from the first thoracic by a common stem with the medial 

 antibrachial cutaneous nerve and in another sends a branch to 

 the dorsal division of the caudal trunk. 



There are 29 cases in which there are 2 or more branches aris- 

 ing from the brachial plexus that were classed as medial brachial 

 cutaneous nerves. This does not necessarily mean that there 

 is a larger supply in these cases but that the branches arise from 



