312 ABRAM T. KERR 



somewhat more distally bj^ the dorsal branch of the caudal trunk 

 (fig. 2). In 2 of these the dorsal fasciculus receives an addi- 

 tional branch or branches. In 1 this comes from the ventral 

 division of the intermediate trunk and is single, in the other it 

 comes from the medial fasciculus and is double. In 5 others, 

 of the above plexuses, one of the branches to the dorsal fasciculus 

 receives an additional branch. This joins the dorsal branch 

 from the cephalic trunk in 3 and comes from the sixth cervical 

 nerve in 2 and from the fifth in 1. It joins the dorsal branch 

 from the intermediate trunk in 1 and arises from the eighth 

 cervical nerve and it joins the dorsal branch from the caudal 

 trunk in 1 and comes from the intermediate trunk. In 2 of the 

 above 86 plexuses the branch from the caudal trunk receives no 

 fiber from the thoracic nerves, but comes from the eighth cervical 

 only. 



In two cases the dorsal division of the cephalic trunk joins the 

 intermediate trunk and the cord thus formed divides into dorsal 

 and ventral parts. The dorsal division joins with the dorsal 

 division of the caudal trunk to form the dorsal fasciculus (fig. 24) . 



In 9 cases the dorsal branches of the fifth and sixth cervical 

 nerves combine to form a dorsocephalic trunk, the equivalent 

 of the dorsal division of the cephalic trunk; this then joins the 

 dorsal division of the intermediate trunk and more distally is 

 joined by the dorsal division of the caudal trunk. 



There is another case exactly like this except that the caudal 

 trunk does not divide into dorsal and ventral branches but after 

 giving off the cutaneous branches splits up into ulnar and medial 

 head of the median nerve and this latter gives off a dorsal branch 

 that takes the place of and is equivalent to the usual dorsal 

 branch of the caudal trunk. 



In 26 plexuses the dorsal divisions of the intermediate and 

 caudal trunks join to form a caudodorsal cord which is joined 

 more distally by the dorsal division of the cephahc trunk (fig. 5). 

 In three of these the posterior fasciculus receives an additional 

 branch, in one from the lateral fasciculus, in two from the medial. 

 In one of the above cases the branch from the caudal trunk comes 

 from the eighth cervical only. In one, the dorsal branch of the 



