688 



MB. F. G. PARSONS ON THE 



[Nov. 20, 



The circumflex nerve rises from the 5th and 6th C. and winds 

 round the neck of the humerus in the usual way, supplying the 

 teres minor and deltoid muscles. 



Fig. 7. 



Brachial Plexus. 



a. Suprascapular. " 



b. Nerve to subscapularis. 



c. Circumflex. 



d. Musculocutaneous. 



e. Musculo-spiral. 

 /. Median. 



Ulnar. 



Internal cutaneous. 



Internal anterior thoracic. 



Nerve to Latissimus dorsi. (The 

 origin of this is only approxi- 

 mate.) 



The external cutaneous is bound up for some little distance with 

 the median, its fibres being derived from the 6th and 7th C. It 

 supplies and pierces the coraco-brachialis and then divides into 

 two branches, the larger of which supplies the biceps, while the 

 smaller runs down to the front of the elbow, where it communi- 

 cates with the median and sends a small branch to the short head 

 o£ the brachialis anticus ; after this it crosses deep to the biceps 

 and supplies part of the outer side of the forearm. 



