AXILLARY. 403 



EELATIONS OF FIRST PORTION OF THE AXILLARY ARTERY. 



In front. 

 Pectoralis major. 

 Costo-coracoid membrane. 

 Cephalic vein. 



Outer side. I Axillary \ Inner side. 



Brachial plexus. I FintpwtJon. J Axillary vein. 



Behind. 



First intercostal space, and Intercostal muscle. 

 First serration of Serratus magnus. 

 Posterior thoracic nerve. 



The second portion of the axillary artery lies beneath the Pectoralis minor. It 

 is covered, in front, by the Pectoralis major and Pectoralis minor muscles; behind, 

 it is separated from the Subscapularis by a cellular interval ; on the inner side, it is 

 in contact with the axillary vein. The brachial plexus of nerves surrounds the 

 artery, and separates it from direct contact with the vein and adjacent muscles. 



EELATIONS OF SECOND PORTION OF THE AXILLARY ARTERY. 



In front. 

 Pectoralis major and Pectoralis minor. 



Outer side. [ *%* \ Inner side. 



Brachial plexus. \Secoud portion.) Axillary vein. 



Behind. 

 Subscapularis. 



The third portion of the axillary artery lies below the Pectoralis minor. It is 

 in relation, in front, with the lower border of the Pectoralis major above, being 

 covered only by the integument and fascia below ; behind, with the lower part of 

 the Subscapularis, and the tendons of the Latissimus dorsi and Teres major ; on 

 its older side, with the Coraco-brachialis ; on its inner or thoracic side, with the 

 axillary vein. The brachial plexus of nerves bears the following relation to the 

 artery in this part of its course ; on the outer side are the median nerve, and the 

 musculo-cutaneous for a short distance ; on the inner side, the ulnar, the internal, and 

 lesser internal cutaneous nerves ; and behind, the musculo-spiral and circumflex, 

 the latter extending only to the lower border of the Subscapularis muscle. 



RELATIONS OF THIRD PORTION OF THE AXILLARY ARTERY. 



In front. 



Integument and fascia. 

 Pectoralis major. 



Outer side. f \ Inner side. 



Coraco-brachialis. [ Artery 7 J Ulnar nerve. 



Median nerve. \ Third portion./ Internal cutaneous nerv 33. 



Musculo-cutaneous nerve. V / Axillary vein. 



Behind. 

 Subscapularis. 



Tendons of Latissimus dorsi and Teres majo'r. 

 Musculo-spiral, and circumflex nerves. 



