480 ARTERIES. 



EELATIONS OF FIRST PORTION OF THE AXILLARY ARTERY. 



In front. 

 Pectoralis Major. 

 Costo-coracoid membrane. 

 Subclavius. 

 Cephalic vein. 



Outer side. / Axillary A Inner side. 



Brachial plexus. Artery. Axillary vein. 



\ Vii-^-t nrvHrvn / * 



Behind. 



First intercostal space, and Intercostal muscle. 

 First serration of Serratus Magnus. 

 Posterior thoracic nerve. 



The second portion of the axillary artery lies behind the Pectoralis Minor. It 

 is covered, in front, by the Pectoralis Major and Minor muscles ; behind, it is 

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

 axillary vein. The brachial plexus of nerves surrounds the artery, and sepa- 

 rates it from direct contact with the vein and adjacent muscles. 



EELATIONS OF THE SECOND PORTION OF THE AXILLARY ARTERY. 



In front. 

 Pectoralis Major and Pectoralis Minor. 



Outer side. I *%** \ Inner side. 



Outer cord of plexus. ISeoowi portion.! Axillary vein. 



Inner cord of plexus. 



Beh ind. 

 Subscapularis. 

 Posterior cord of plexus. 



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

 is in relation, in front, with the lower part 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 outer side, with the Coraco-brachialis ; on its inner, or thoracic side, with the 

 axillary vein. The nerves of the brachial plexus bear the following relation 

 to the artery in this part of its course ; on the outer side is 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 Subscapu- 

 laris muscle. 



RELATIONS OF THE THIRD PORTION OF THE AXILLARY ARTERY. 



In front. 



Internment and fascia. 

 Pectoralis Major. 



Outer side. / N, Inner side. 



Coraco-brachialis. / Axillary \ Ulnar nerve. 



Median nerve. f , . Artery. Internal cutaneous nerves. 



Musculo-cutaneous nerve. V Ilir por ' '] Axillary vein. 



Behind. 

 Subscapularis. 



Tendons of Latissimus Dorsi, and Teres Major. 

 Musculo-spiraU and circumflex nerves. 



