SHOULDER SCAPULAR REGION 79 



separated from the shoulder-joint by the muscles which are 

 attached to the proximal end of the humerus and by the 

 subacromial bursa. The full, rounded appearance of the 

 shoulder is due to the deltoid passing over the proximal end 

 of the humerus and the muscles attached to it. When the 

 head of the humerus is dislocated the muscle passes vertically 



Descending branch of transverse cervical artery 

 Suprascapular nerve and transverse 

 , scapular artery 



Coracoid process 



Capsule of shoulder -joint 

 / Tendon of supraspinatus 



Tendon of infra- 

 spinatus 



Subscapular artery 

 Infrascapular branch 

 Circumflex scapulae artery 

 Posterior circumflex artery and ' _ 



axillary nerve Nerve to teres minor 



FIG. 34. Dissection of the Posterior Scapular Region. 



from its origin to its insertion, and the dislocation is 

 recognised by the squareness or flatness of the shoulder. 

 Under cover of the posterior part of the deltoid are portions 

 of the muscles which spring from the posterior surface of the 

 scapula, viz., the infraspinatus, teres major, and teres minor, 

 and the proximal part of the long head of the triceps, which 

 arises from the upper part of the axillary border of the 

 scapula. Under its middle part lie the insertion of the 



