I'.llACHIAL PLEXUS. 



509 



a short distance by the artery. Near the deep humeral artery, 

 it turns round the back of the humerus, between the caput mag- 

 num and humeralis obliquus, and passing down the outer surface 

 of the bone, gains the anterior face of the elbow joint and radius, 

 where it meets the anterior radial artery, and accompanies it 

 almost as far as the carpus, supplying the extensor muscles of 

 the forearm. In its course it gives off branches to the caput 



FIG. 190. 



Internal aspect of right anterior extremity showing the 

 brachial plexus, a, Seventh cervical nerve ; 6, Eighth cervical 

 nerve ; c, First dorsal nerve ; d. Branch from second dorsal 

 nerve ; e, Anterior thoracic ; /, Posterior thoracic ; g, Anterior 

 scapular; h, Snbscapular ; i, Axillary; k, Cubital; I, Small 

 muscnlo-cntaneous branch m. Radial ; n, p, Median ; o, Musculo- 

 cutaneous. 



muscles and scapulo-ulnaris, to the elbow joint, and to the skin 

 covering the arm. 



The ULNAR or CUBITAL NERVE is formed of fibres from the 

 dorsal nerves; it is less than the radial, and originates on the 

 outer side of the humeral artery, which it accompanies beyond 

 the origin of the deep humeral artery; crossing the latter, and 



