184 



THE NERVOUS SYSTEM. 



the under surface and posterior border of the Muse-, latissimus dorsi 

 to the skin of axilla and dorsal surface of the upper arm. 



(d) Several small branches are given 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 

 J///.SY-. subscajmlaris and the M. transverso-scapularis on the one side, 



Fig. 122. 



The brachial plexus. 



Cc N. coraco-clavicularis gg Muse, subscapularis 



Cc' Nerve to muse, obliq. abdom . interims. ^ S I First spinal nerve. 



d Deltoid muscle. _ SII Second spinal nerve. 



la Muse. lev. ang. scap. ^ Sill Third spinal nerve. 



Id Muse. lat. dorsi. He Rainus cutaneus axillaris. 



oi Muse, obliq. abdom. intern. life Ramus cutaneus abdominalis. 



fc Muse, stemo-mastoid. 



and the long head of the M. triceps brac/iialis on the other, and are 

 lost in the M. deltoideus and the M. infmspinatus. 



The N. bracfiiali* continues its course by passing- bet\veen the 

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

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



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

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



