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MUSCLES OF THE UPPER EXTREMITY. 



The muscles of the upper extremity may be arranged into groups 

 corresponding with the different regions of the limb, thus : 



Anterior Thoracic Region. 



Pectoralis major, 

 Pectoralis minor, 

 Subclavius. 



Anterior Scapular Region. 

 Subscapularis. 



Lateral T/ioracic Region. 

 Serratus magnus. 



Posterior Scapular Region. 



Supra-spinatus, 

 Infra- spinatus, 

 Teres minor, 

 Teres major. 



Acromial Region. 



Deltoid. 

 Anterior Humeral Region. Posterior Humeral Region. 



Coraco-brachialis, Triceps. 



Biceps, 



Brachialis anticus. 



Anterior Brachial Regioi 

 Superficial layer. 



Pronator radii teres, 

 Flexor carpi radialis, 

 Palmaris longus, 

 Flexor sublimis digitorum, 

 Flexor carpi ulnaris. 



Deep layer. 



Flexor profundus digitorum, 

 Flexor longus pollicis, 

 Pronator quadratus. 



Posterior Brachial Region. 

 Superficial layer. 



Supinator longus, 



Extensor carpi radialis longior. 



Extensor carpi radialis brevior, 



Extensor communis digitorum, 



Extensor minimi digiti, 



Extensor carpi ulnaris, 



Anconeus. 



Deep layer. 



Supinator brevis, 

 Extensor ossis metacarpi pollicis, 

 Extensor primi internodii pollicis, 

 Extensor secundi internodii pollicis, 

 Extensor indicis. 



