MUSCLES OF THE AEM. 



379 



The commonest variety is one in which the more superficial (distal) part of the muscle extends 

 more distally than usual, so as to be inserted into the medial intermuseular septum, or even into 

 the medial epicondyle of the humerus. A third slip (coracobrachialis superior or brevis, 



INSERTION 



iiK I'KCTOR- 

 i.LIS MAJOR 

 yORACOBRACHIALIS 



SHORT HEAD OF 



B.ICEPS 



LONG HEAD OF 



BICEPS 



BICEPS (medial head) 



-.vY-^Al,** 



; 



INSERTION OF 

 PECTORALIS 



MINOR 



DELTOID 



illary artery 



Musculo- 

 cutaueous nerve 

 Median nerve 

 (lateral head) 

 Median nerve 

 (medial head) 



Ulnar nerve 



PRONATOR TERES T^O^lu^ [N/, 



Deep fascia of forearm 



FLEXOR CARPI RADIALIS 



PALMARIS LONGUS 

 FLEXOR CARPI ULNARIS 

 FLEXOR DIGITORUM SUBLIMIS 



FLEXOR POLLICIS LONGUS 



PRONATOR QUADRATUS 

 Ulnar artery 



Ulnar nerve 



aus 



Jr^j^JL 



TRAPEZIUS 



LATISSIMUS 



DO RSI 



EXTENSOR CARPI RADIALIS 

 LONGUS 



EXTENSOR CARPI RADIALTS 



BREVIS 



Deep fascia of forearm 



EXTENSOR DIGITORUM 

 COMMUNIS 



EXTENSOR CARPI ULNARIS 



__ ABDUCTOR POLLICIS LONGUS 



EXTENSOR POLLIOIS BREVIS 



EXTENSOR DIGITI 

 QUINTI PROPRIUS 



TENDONS OF RADIAL IEXTENS< 

 OF CARPUS 



Dorsal carpal ligament 

 EXTENSOR POLLICIS LONGUS 

 EXTENSOR INDICIS PROPRIUS 



3. SUPERFICIAL MUSCLES ON THE ANTERIOR ASPECT OF 

 THE RIGHT ARM AND FOREARM. 



FIG. 339. THE MUSCLES ON THE POSTERIOR Si] 

 OF THE LEFT ARM, FOREARM, AND HAND. 



rotator humeri) may more rarely be present, forming a short muscle arising from the root of the 

 coracoid process, and inserted into the medial side of the humerus just distal to the capsule of 

 the shoulder-joint. 



