29< ELEMRNTAR Y ANA TOMY. [LESS. 



margin of the glenoid cavity; the other, shorter, from the 

 coracoid process. The muscle formed by the union of these 

 heads is inserted into the tubercle of the radius. 



Brachialis anticus. This term is applied to a muscle 

 placed beneath the biceps, springing from the front of the 

 humerus and inserted into the coronoid process of the ulna. 



The triceps is the largest muscle of the arm, and is inserted 

 into the olecranon. It arises by three heads : one (long) 

 from the lower border of the glenoid cavity, one (external] 

 from the humerus below the great tuberosity, one (internal 

 or short] from the inner surface of the humerus. 



FIG. 271. SUPERFICIAL FLEXOR MUSCLES OF RIGHT FORE-ARM, 



i, biceps; 2, brachialis anticus ; 3, triceps; 4, pronator teres ; 5, flexor carpi 

 radialis ; 6, palmaris longus ; 7, flexor carpi ulnaris ; 8, supinator longus ; 9, 

 extensor carpi radialis longior et brevior ; 10, flexor sublimis digitorum ; n, 

 abductor pollicis ; 12, opponens pollicis J 13, palmaris brevis. 



8. The MUSCLES OF THE FORE-ARM consist of pronators 

 and supinators, flexors and extensors. 



Pronator teres. A muscle thus named rotates the fore-arm 

 in the way described in- the lesson on the bones of the arm 

 under the name "pronation." It arises from the inner condyle 



