THE PROPER LIGAMENTS OF THE SCAPULA 131 



hanging from the edge of the clavicle in the upper part of the 

 joint or covering the whole articular surface of the acromion, 

 or in 3 out of 400 cases wholly dividing the joint into two 

 cavities. 



The coracoclavicular ligaments connect the clavicle more 

 firmly with the scapula; there are three. The posterior coraco- 

 clavicular comprises the trapezoid and conoid. The trapezoid 

 is external, and attached below to the upper surface of the 

 coracoid, and above to the oblique line passing forward and 

 outward on the under surface of the clavicle. Its outer border 

 is free, and its internal border unites with the conoid, forming 

 an angle projecting backward. This checks forward move- 

 ment of the clavicle. 



The conoid is posterior and internal, and attached by its 

 apex to the base of the coracoid, and by an expanded base 

 to the conoid tubercle and a line internal to it on the under 

 surface of the clavicle. This checks backward movement of 

 the clavicle. Between these two ligaments a bursa may be 

 developed, and between them is also the extremity of the sub- 

 clavius muscle. 



The synovial membrane is usually single, or double when 

 the interarticular cartilage is complete. 



Nerves, suprascapular and circumflex. Arteries, supra- 

 scapular and acromial thoracic. Movements of joint, gliding 

 and rotation. 



THE PROPER LIGAMENTS OF THE SCAPULA 



They pass between portions of the scapula, the coracoid 

 and acromial processes, but are not parts of a joint. 



The ligaments are coracoacromial, superior, and inferior 

 transverse. 



The coracoacromial is attached by its apex to the summit 

 of the acromion, and by the base to the whole length of the 

 outer border of the coracoid process of the scapula. The 

 superior transverse ligament is attached to the base of the 

 coracoid process and the inner margin of the suprascapular 

 notch. The inferior transverse (spinoglenoid) is attached to 

 the outer border of the spine and the margin of the glenoid 

 cavity. It is not always present. 



