184 



THE NERVOUS SYSTEM. 



the under surface and posterior border of the Mnsc. latissinnis dorsi 

 to the skin of axilla and dorsal svirfaee of the ujjper arm. 



[(1) Several small branches are g-iven off from the upper and an- 

 terior surfaces of the brachial nerve near the Foramen ovale ; they 

 accompany an artery to pass forwards and upwards between the 

 Muse, suhscajnilaris and the M. traiiBveno-scapulans on the one side, 



Ce N. cpraco-claviculavis 



Cc' Nerve to muse, obliq. ubiloin. iiitornus. 



rf Deltoid nmscle. 



la Muse. lev. ang. soap. 



Id Muse. lat. dorsi. 



vi Muse, obliq. abdoni. intern. 



,vc Muse, sterno-mastoid. 



Tlie brachial plexus. 



ss Muse, subscivpularis 



H I First spiiiiU nerve. 



S // Second spinal nerve. 



<S/// Third spinal nerve. 



lie Riunus cutaneus axillaris. 



11 le Ramus cutaneus abdominalis. 



and the ]on<»' head of the M. triceps hrachialls on the other, and are 

 lost in the J/. deUoideus and the M. iufrasjjinatus. 



The N. hrachialls continues its course by passing between the 

 long- and inner heads of the M. triceps, reaches the arm and splits 

 into two nerves, the N. nlnaris and the N. radialis. 



[I.] The N. uluaris (Fig. 123 U) escapes from cover of the long 

 head of the M. triceps and runs obliquely over its inner head 



