FIG. 65. Diagrammatic drawing of the relations of structures in the anterior humeral region. Pectoralis 

 major and Deltoid are indicated as transparent, their margins showing as thick black lines, and t In- 

 latter muscle is seen to lie on the former, covering in its insertion. The Pectoralis major gives an 

 expansion upwards under cover of Deltoid, which reaches the capsule and is attached to the outer lip 

 of the groove above the insertion of the main tendon. The two heads of Biceps and Coraco-brachialis 

 are in the next (deeper) plane, therefore in contact with the tendon and its expansion, and the tendon 

 of Subscapularis is immediately deep to them, so that, when the humerus is everted and the long head 

 of Biceps carried outwards, the Subscapular tendon is " exposed " between the heads of the Biceps 

 and is covered by the expansion as seen in the figure. The structures which form the posterior wall 

 of the axilla go to the bone in the neighbourhood of the inner lip, and those of the front wall reach the 

 outer lip of the bicipital groove, and of the structures placed between them, the long tendon lies against 

 the bone between these lips, and the Coraco-brachialis forms the outer wall of the axilla. 



P Major 



f.mncr. 



Micept 



Munervs 



FIG. 66. A scheme of a section through the axilla at about a level half-way down the preceding figure. 

 Both figures are for comparison with Figs. 51 and 63. 



