

NERVES OF THE ARM. 



muscle and the bone, to the outer side of the humerus, 

 between the triceps and the brachialis anticus muscles. 

 At the bend of the elbow it divides into an anterior and 

 posterior branch. 



The anterior, called ramus superficial anterior, appears 

 to be the continued trunk of the radial, accompanies the 

 radial artery to a little below the middle of the radius, and 

 then goes beneath the tendon of the supinator longus to 

 the back of the hand, where it becomes cutaneous and 

 divides into two branches, the one supplying the back of 

 the hand, the thumb, the fore and middle fingers; the other 

 going to the muscles and integuments of the thumb. 



The posterior branch of the radial, called also posterior 

 interosseal, or ramus profundus dorsalis, gets to the back of 

 the forearm, accompanies the posterior interosseal artery, 

 and supplies the extensor muscles. 



Above the external condyle, a short distance, a branch 

 called ramus superficialis dorsalis is given off. After send- 

 ing filaments to the supinators and extensors at the outer 

 condyle, it becomes cutaneous, and descends the forearm 

 along the radial margin of the supinator longus to the 

 back of the hand. 



The intercosto-humeral nerves (Fig. 234) are described as 

 two branches, one coming from the second, the other from 

 the third thoracic. The first is seen beneath the second, 

 the other beneath the third rib. The first is connected with 

 the lesser internal cutaneou^, and supplies the axilla, its 

 skin and glands; the other descends as low as the elbow, 

 chiefly supplying the integuments on the back of the arm. 



SUMMARY OF THE MUSCLES OF THE SUPERIOR EXTREMITY. 



MUSCLES OF THE SHOULDER. 

 Deltoid. Teres-minor. 



Supra-spinatus. Teres-major. 



Infra-spinatus. Subscapularis. 



MUSCLES OF THE ARM. 

 ON THE FRONT. ON THE BACK. 



Biceps flexor cubiti. 

 Coraco-brachialis. 

 Brachialis anticus. 



Triceps extensor cubiti. 

 Anconeus. 



