THE BRACHIAL PLEXUS. 



.External anterior thoracic. 



' Internal anterior thoracic. 

 'Musculo- cutaneous. 



767 



Median. 



Musculo-spiral. 

 Posterior 



interosseow. 



Radial. 



Anterior 



interosseous. 



FIG. 413. Nerves of the left upper extremity. 



scaleni muscles, and then above and to the outer side of the subclavian artery : it 

 next passes behind the clavicle and Subclavius muscle, lying upon the first serra- 



