322 HUMAN ANATOMY. 



The former supplies the pectoralis major and the latter the pec- 

 toralis minor, and sending branches to the pectoralis major. 



The subscapular nerves are three in number. The upper 

 subscapular supplies the subscapular muscle, the lower sub- 

 scapular nerve supplies the teres major and subscapularis, the 

 middle or long subscapular supplies the latissimus dorsi. 



The circumflex nerve accompanies the posterior circumflex 

 artery, passing through the space formed between the teres major, 

 teres minor, and long head of the triceps to supply the shoulder- 

 joint and skin over the shoulder and the neighboring muscles. 

 It gives off two branches, an upper and a lower branch. 



The musculo-cutaneous nerve pierces the coraco-brachialis 

 muscle and descends the arm to supply the brachialis anticus, 

 biceps, coraco-brachialis, and the skin of the forearm. At the 

 outer border of the tendon of the biceps, above the elbow, it be- 

 comes superficial and divides into two branches the anterior 

 descending the radial side of the forearm to the wrist and supply- 

 ing the skin of that part, the posterior branch descending the 

 back part of the radial side of the forearm to the wrist to supply 

 that part. 



The internal cutaneous nerve descends the inner side of the 

 arm together with the basilic vein to about its middle, where 

 it becomes cutaneous, supplying the skin of this region. It has 

 an anterior and a posterior branch. 



The lesser internal cutaneous nerve of Wrisberg is derived 

 from the inner cord, and receives filaments from the eighth cer- 

 vical, first dorsal, and the intercosto-humeral nerve, and is dis- 

 tributed to the skin on the inner side of the arm. 



The median nerve, formed by a root from the outer and 

 inner cord'bf the brachial plexus, descends the arm, crossing the 

 brachial artery from its outer to its inner side at the bend of the 

 elbow. Its branches are: 



Muscular branches, supply all the superficial anterior muscles ex- 

 cept the flexor carpi ulnaris; 



Anterior 'inlerosseous, supplies all the deep anterior muscles except 

 the inner half of the flexor j3rofundis digitorum; 



Palmar cutaneous, crosses above" tfte~ annular ligament, divides into 

 two branches to supply the ball of the thumb and the palmar surface 

 of the hand ; 



Branches to the muscles of the thumb, supplies the opponens, outer 

 head of the small flexor, and the abductor; 



Digital branches, supply both sides of the thumb, index and middle 

 and the radial side of the ring finger. 



The ulnar nerve descends the inner side of the axillary 

 artery to the middle of the arm, where it crosses the internal head 

 of the triceps, and accompanies the inferior profunda artery to 



