NERVES OF THE UPPER LIMB. 



647 



intercosto-humeral nerve is of larger size than usual, and takes the place of the nerve 

 of Wrisberg, only receiving in the axilla a small filament from the brachial plexus ; 



Fig. 429. 



Fig. 428. ANTERIOR CUTANEOUS NERYES OF THE SHOULDER AND ARM (from Sappey after 

 Hirschfeld and Leveilld). I 



1, 1, snpraclavicular and supraacromial nerves from the cervical plexus ; 2, 2, 2, 

 cutaneous branches of the circumflex nerve ; 3, 4, upper branches of the internal cuta- 

 neous nerve ; 5, superior external cutaneous branch of the musculo- spiral ; 6, internal 

 cutaneous nerve piercing the deep fascia ; 7, posterior branch ; 8, communicating twig 

 with one of the anterior branches ; 9, 10, anterior branches of this nerve, some turning 

 round the median basilic and ulnar veins ; 11, musculo-cutaneous nerve descending over 

 the median cephalic vein ; 12, inferior cutaneous branch of the musculo-spiral nerve. 



Fig. 429. ANTERIOR CUTANEOUS NERVES OP THE FOREARM AND HAND (from Sappey 

 after Hirschfeld and Leveille). fe 



9, 10, 13, distribution of the anterior branches of the internal cutaneous nerve; 14, 

 union of one of these with a twig of the ulnar nerve ; 12, inferior cutaneous branch of 

 the musculo-spiral nerve; 11, 15, distribution of the external cutaneous nerve; 16, 

 union of one of its branches with 17, the terminal branch of the radial nerve ; 18, 

 palmar cutaneous branch of the median nerve; 19, 20, internal and external collateral 

 branches to the thumb from the median nerve ; 21, external collateral to the index 

 finger ; 22, 23, collateral branches to the index, middle and fourth fingers ; 24, 25, 

 collateral branches from the ulnar nerve to the fourth and fifth fingers ; the network of 

 communicating twigs formed by the terminal branches of these cutaneous nerves is repre- 

 sented at the extremities of the fingers. 



