THE BRACHIAL MUSCLES. 



587 



and passes downward and laterally to be inserted into the external surface of the olecranon 

 process of the ulna. Notwithstanding its position upon the posterior surface of the arm, it is a 



Fig. 570. 



 Clavicle — ;' 

 Subclavius 



Biceps] 



f Short head. 



[ Long head 

 Deltoid 



Tendon of in- 

 sertion of pec- 

 toralis major 



Brachialis anticus 



Tendon of insertion 

 of biceps 



Brachio-radialis 



"fttefe. 



■^53 



^#^i 



Pectoralis minor 



Fig. 571. 



""^Coraco- 

 brachialis 



fendon of latissimus 



Brachialis anticus 



hiner head of triceps 



Int. intermuscular 



septum Tj J t / 



Brachialis anticus ^^^ad ot_f 

 radius 



Bicipital 



tuberosity of radius 



Insertion of biceps 



Supinator 



Bicipital fascia 



Internal 

 condyle 



Coronoid pro- 

 cess of ulna 



feiv.... .'.'— ^^''' 



Muscles of anterior surface of arm. 



<*.. 



Brachialis anticus and supinator, 

 seen from ni front. 



derivative of the pre-axial muscle-sheet and is supplied by the ulnar ner\e, whose main stem, 

 as it passes down between the olecranon and the inner condyle, is covered by the muscle. 

 When absent, the muscle is represented by a strong fibrous band. 



