208 ELEMENTS OF MAMMALIAN ANATOMY. 
branches of the sixth, seventh, and eighth cervical 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 about two 
Fic. 105. VrntTrAL 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; cx, circumflex nerve; cu, internal cutaneous; 
de, to the deltoid; g, to the digits; f, to the digits; fo, supracondy- 
loid foramen; /t, long thoracic; mc, musculocutaneous; me, median 
nerve; pi, posterior interosseous; pth, posterior thoracic; sp, mus- 
culospiral; sp, to suprascapular region; sb, to subscapular region: 
sv, subscapular; ra, radial; un, ulnar nerve. 
