SHOULDER SCAPULAR REGION 



81 



part of the axillary nerve and the anterior and posterior 

 humeral circumflex vessels. 



Bursa Subacromialis. The subacromial bursa is a large 

 bursal sac which intervenes between the acromion and deltoid 

 above, and the muscles which immediately cover the upper 

 aspect of the capsule of the shoulder-joint below. It facili- 

 tates the play of the proximal end of the humerus and the 



Capsula art 



Posterior humeral 

 circumflex vessels 

 and axillary nerve 



Labrum glenoidale 



Capsula articularis 

 N. axillaris 



Posterior humeral 

 circumflex vessels 



FIG. 36. Diagram of a Frontal Section of the Right Shoulder. 



attached muscles on the under aspect of the acromion and 

 deltoid. 



The Quadrangular and Triangular Spaces. Neither of 

 these so-called spaces has any real existence until the 

 boundaries are artificially separated from one another. 

 When viewed from the front the triangular space is bounded 

 above by the subscapularis, below by the teres major, and 

 laterally by the long head of the triceps, but at the back the 

 teres minor replaces the subscapularis as the upper boundary. 

 The circumflex scapular branch of the subscapular artery 

 enters the space from the front, turns round the axillary 



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