298 



Muscles of the Ami. 



M. pectoralis major 

 M. deltoideus 



M. coracobrachial is 



M. biceps brachii 



M. serratus anterior 



M. triceps bracliii 



343. Muscles of the right axilla, viewed from below. 



(The upper arm has been lifted to the horizontal plane.) 



The axilla, when the upper arm is maintained in the horizontal plane, has the shape 

 of a three-sided pyramid, the apex of which lies above, below the clavicle, and the base of 

 which coiTesponds to the lower wall, covered only by skin and fascia. This inferior wall is 

 bounded in front by the m. pectoralis major, behind by the mm. latissimus dorsi and teres 

 major, median ward by the m. serratus anterior. The anterior wall is formed by the mm. pecto- 

 ralis major and pectoralis minor, the posterior wall by the mm. latissimus dorsi, teres major 

 and m. subscapidaris, the medial wall by the m. serratus anterior. Along the angle between 

 the anterior and posterior wall lies the m. coracobrachialis ; in the groove behind the latter, 

 between it and the muscles of the posterior wall, run the vessels and nerves. The axilla is 

 filled with blood vessels, lymph vessels, lymph glands, nerves, and masses of fat. 



