276 A MANUAL OF ANATOMY. 



vein lies to the inside and a little in front of the artery for 

 its entire extent. Besides the vein there is the internal an- 

 terior thoracic nerve to the inside of the first portion of 

 the artery, the inner cord of the brachial plexus for the 

 second, and the ulnar nerve for the third part. These 

 nerves intervene between the artery and the vein. Also at 

 the inner part of the third portion is the lesser, and the in- 

 ternal cutaneous nerves, and the inner head of the median. 

 On the outside, for the first part, are the cords of the 

 brachial plexus ; for the second part, the outer cord of 

 the same, and the coracoid process ; for the third part, the 

 median and musculocutaneous nerves, the coracobrach- 

 ialis and biceps muscles. 



Behind the first part is the first intercostal space and 

 muscle, second rib, and second digitation of the serratus 

 magnus muscle, and the posterior thoracic nerve. In the 

 second part, posterior cord and first subscapular nerve, and 

 the subscapularis muscle. Behind the third part, the mus- 

 culospiral, second and third subscapular and the circum- 

 flex nerves, the subscapularis, teres major, and latissimus 

 dorsi muscles. In front of all parts of the artery, the skin, 

 superficial and deep fascia, and the pectoralis major muscle 

 (does not cover the lower part of the artery). In front of 

 the first part, origin of platysma, cephalic and acromio- 

 thoracic artery, veins and branches, external anterior thor- 

 acic nerve, axillary lymphatic trunk and costocoracoid 

 membrane. Over the second part, the pectoralis minor 

 muscle. In front of the third portion, inner head of 

 median, outer brachial vena comes. 

 Branches of the Axillary Artery. 



First Portion. (a) Superior thoracic. This is a small 

 artery from the inside of the axillary close below the sub- 

 clavius muscle. It passes to the first intercostal space 



