338 ABRAM T. KERR 



branch to the muscle (figs, 8, 10, 13). In another of the above 19 

 the nerve to the coracobrachiaUs muscle gives off a branch that 

 rejoins the lateral fasciculus close to the point where the muscu- 

 locutaneous nerve arises. In one of the above 19 the musculo- 

 cutaneous arises from a trunk in common with the ulnar and 

 median nerves and in another it is given off from the median in 

 two separate branches. 



In 3 instances there is a second branch from the lateral fascic- 

 ulus to the coracobrachialis muscle. In 8 cases the second 

 branch to the muscle arises from the musculocutaneous nerve 

 (fig. 12), and in 5 others there are two additional branches both 

 coming from the musculocutaneous nerve. 



There is another plexus in which in addition to the nerve from 

 the lateral fasciculus there is another nerve to the muscle arising 

 from the seventh cervical nerve and another in which the second 

 nerve comes from the lateral head of the ulnar nerve (fig. 24). 



In 8 cases the nerve to the coracobrachialis muscle arises from 

 the seventh cervical nerve. (These are in addition to the case 

 mentioned above where there was a communicating branch from 

 the seventh cervical to one of the four branches arising from the 

 musculocutaneous nerve.) In 4 of these this is the only branch 

 to the muscle, in 4 there is a second branch coming from the 

 musculocutaneous nerve. 



In 4 plexuses in which the musculocutaneous does not arise 

 from the lateral fasciculus of the plexus but from the trunk 

 formed by the lateral fasciculus and the medial head of the 

 median, the nerve to the coracobrachialis also arises from this 

 trunk (fig. 6). In one case one of the nerves to the muscle 

 arises from the median, the other from the musculocutaneous 

 which in this case also comes from the median. In 2 instances 

 one nerve comes from the lateral head of the median and the 

 other from the musculocutaneous (fig. 22). In 1 case there is 

 but one branch and this comes from the lateral head of the 

 median, in another the single branch to the muscle comes from 

 the medial head of the median (fig. 4) . 



My maceration experiments seem to indicate that in some 

 instances where at least one of the nerves to the coracobrachialis 



