THE UPPER LIMB 



347 



Mnseles eoneerned in the Movements — Forward Flexion. — The clavicular 

 parts of the pectoralis major and deltoid, short head of the biceps, and coraco- 

 brachiaUs. Extension. — ^The spinal portion of the deltoid, teres major, and 

 latissimus dorsi. Backward Flexion. — This movement being a continua- 

 tion backwards of extension, the muscles concerned are the same as for that 

 movement. Abduction. — The acromial portion of the deltoid and supra- 

 spinatus. Adduction. — The stemo-costal portion of the pectoraUs major, 

 short head of the biceps, coraco-brachiaUs, teres major, and latissimus dorsi. 



Suprascapular Nerve Snprascapular Artery C^isular Ligament 



Transverse Lig. 



Post. Belly of \ 1 



Omohyoid \ \ \ fj^ ' ^^^^^-'t-^"^^^^^^?^^ >^,^J^-. Supra- 



spinatus 



Spino-glenoid 

 Ligament 



Long Head of Triceps 



Fig. 192. — The Right Shoulder-Joint (Posterior View). 



External Rotation. — Infraspinatus and teres minor. Internal Rotation. — 



Subscapularis, pectorahs major, teres major, and latissimus dorsi. Circum- 

 duction. — This movement, being a combination of flexion, abduction, exten- 

 sion, and adduction, is effected by the various muscles concerned in these 

 movements. 



Bursae at Shoulder-Joint. — The bursae in the vicinity of the 



shoulder- joint are as follows: 



Subscapular. 

 Subacromial. 

 Infraspinatus. 

 Latissimus dorsi. 



Teres major. 



Coraco-clavicular ligament. 

 Bicipital intertubdrcular. 



The subscapular bursa Ues between the upper border of the tendon 

 of the subscapularis muscle and the upper part of the front of the 

 capsular hgament. It is continuous with the synovial membrane 

 of the joint, which protrudes through the foramen ovale in the 

 capsule. 



The subacromial or subdeltoid bursa, which is of large size, is 



