22O 



ELEMENTS OF MAMMALIAN ANATOMY. 



nerves and the first thoracic nerve form the brachial 

 plexus. This may be displayed by removing the cephalo- 

 humeral muscle and cutting through the pectoral muscles 





: 



FIG. 101. VENTRAL ASPECT OF THE BRACHIAL PLEXUS AND CHIEF NERVES 



OF THE ARM. 



6, 7, 8, and 1, Sixth, seventh, and eighth cervical and first dorsal nerves; 

 at, ath, anterior thoracic nerves ; a and b, to muscles of the forearm ; 

 c and d, to the joint; ex, circumflex nerve; cu, internal cutaneous; 

 de, to the deltoid ; g, to the digits ; /, to the digits ; fo, supracondyloid 

 foramen ; It, long thoracic ; me, musculocutaneous ; me, median nerve ; 

 pi, posterior interosseous ; pth, posterior thoracic ; sp, musculospiral ; 

 sp, to suprascapular region ; sb, to subscapular region ; ex, subscapular ; 

 ra, radial ; un, ulnar nerve. 



