18 



HANDBOOK OF ANATOMY 



Shoulder-Joint, between the head of the humerus and the 

 glenoid cavity of the scapula. 



A ball-and-socket joint, permitting of particularly free move- 

 ment as the socket is very shallow and much smaller than the 

 ball. Movement can take place roiind three axes, viz. 

 Transverse flexion and extension. 

 Antero-posterior abduction and adduction. 

 Vertical rotation in and out. 



Supraspinatus 



- Infraspinatus 



:^|E- vj-~ Teres Minor 



Teres Major * 



Tares Branch of Dorsalis 

 Scapulae Artery 

 Dorsalis Scapulae Artery \r 

 Triangular Space 

 Nerve to Teres Minor, wirh-" 

 Gangliform Enlargement 



Posterior Circumflex Artery 

 and Circumflex Nerve in 

 Quadrangular Space 



- Pectoralis Major 



- - Deltoid 



FIG. 6. MUSCLES OF THE SHOULDER- JOINT. 



Ligaments. A capsule surrounds the joint attached to the 

 anatomical neck of the humerus and the edge of the glenoid 

 fossa outside the ligament. Inferiorly the attachment of the 

 capsule runs down a little way 011 the shaft of the humerus. 



