266 



APPLIED ANATOMY. 



THE ARM. 



The arm or upper arm is formed by a single bone surrounded by muscles, 

 which, with the exception of the biceps, are attached to it. The main vessels and 

 most of the important nerves run down its inner side. It receives from the trunk the 

 insertions of the muscles which move it, and gives origin to the muscles which move 



Anatomical nee 



Supraspinatus. 



Greater tuberosity, 

 Lesser tuberosity 



Bicipital groov 

 Surgical neck 



Pectoralis major 



Deltoid 



Brachioradialis 



Extensor carpi 

 radialis longior 



Radial fossa 



Capitellu 



Subscapularis 



Latissi- 

 mus dorsi 



Teres major 



Anatomical 

 neck' 



Triceps (ex- 

 ternal head) " 



Triceps (in- 

 ternal head)- 



Olecranon 



Pronator fossa^ 



radii teres 

 Common flexor 

 tendons 



Flexor carpi 

 ulnaris and 

 other flexors 



Trochlea 



-Su praspinatus 

 -Infraspinatus 



Greater tuberosity 

 -Teres minor 



-Deltoid 



Brachialis anticus 

 Musculospiral 

 (radial) groove 



Trochlea 



FIG. 277. Anterior surface of humerus, showing 

 attachment of muscles. 



FIG. 278. Posterior surface of humerus, showing 

 attachment of muscles. 



the forearm. It is more subject to injury than to disease; infection, caries, and 

 rickets may attack the bone and rarely new growths may occur, but its common 

 affections are wounds involving the muscles, blood-vessels, or nerves, and fractures 

 of the bone. Severe injuries occasionally necessitate amputation. 



