60 



ANATOMY. 



FIG. 33. 



Describe the Sterno-clavicular Articulation. It is an arthrodial joint, 

 formed by the sternal end of the clavicle with the sternum and the cartilage 

 of the 1st rib. It has an interarticular fibro-cartilage, 2 synovial membranes, 

 and 4 ligaments, viz. 



Anterior Sterno-clavicular. Inter clavicular. 



Posterior Sterno-clavicular. Costo-clavicular or Rhomboid. 



Describe the Scapulo-clavicular Articulation. It is an arthrodial joint, 

 formed by the outer extremity of the clavicle and the acromion process of the 

 scapula. It frequently has an interarticular fibro-cartilage and 2 synovial 

 membranes; usually but I synovial membrane is present, and 3 ligaments, 

 viz. 



Superior Acromio clavicular)- Coraco-clavicular 1 f Trapezoid, externally. 



Inferior Acromio-clavicular. divided into I Conoid, internally. 



What are the proper Ligaments of the Scapula? They are 2, the coraco- 



acromial, and the transverse, as follows. 



Coraco-acromial? completes the vault par- 

 tially formed by the 2 processes over the 

 head of the humerus. 



Transverse , 4 from the base of the coracoid 

 process to the margin of the suprascapular 

 notch, converting it into a foramen, for 

 the supra-scapular nerve. 



Describe the Shoulder-joint. It is an 

 enarthrodial joint, formed by the head of the 

 humerus and the glenoid cavity of the scapula. 

 It has a Synovial Membrane which is reflected 

 upon the tendons of the biceps, subscapularis, 

 and infraspinatus muscles, and communicates 

 with bursse beneath the 2 latter tendons. Its 

 Arteries are derived from the anterior and 

 posterior circumflex and the suprascapular; 

 its Nerves from the circumflex and the supra- 

 scapular. It has 3 ligaments, viz. 



Capsular? from the margin of the glenoid cavity to the anatomical neck of 

 the humerus ; has 3 openings for the reflexions of the synovial membrane 

 over the tendons. 



Coraco-humeralp intimately united with the capsular, extends from the cora- 

 coid process to the greater tuberosity. 

 Glenoid, a fibro-cartilaginous ring, continuous above with the tendon of the 



