SHOULDER SCAPULAR REGION 57 



Joint). This is a diarthrodial joint, and the ligaments 

 which bind the bones together are : 



Ligaments proper to the f I. Superior } kr> 



joint . . . \ 2. Inferior / 



Accessory ligaments Coraco-clavicular | 



The superior acromio- clavicular ligament is a broad band, 

 composed of stout fibres, which is placed on the upper 

 aspect of the joint. The inferior acromio-clavicular ligament 

 which closes the joint below is not so strongly developed. 

 In front and behind, these ligaments are connected with each 

 other so as to constitute a capsule. The joint should now 

 be opened, when it will be seen to be lined by a synovial 

 membrane. An imperfect meniscus is also usually present. 

 It is wedge-shaped, and connected by its base to the superior 

 ligament, whilst its free margin is directed downwards between 

 the bones. 



Lig. Coracoclaviculare (Coraco-clavicular Ligament). This 

 powerful ligament binds the under surface of the clavicle 

 to the base of the coracoid process. When thoroughly 

 cleaned and defined it will be seen to consist of two parts, 

 which are termed the conoid and the trapezoid ligaments. 



The ligamentum conoideum placed upon the posterior 

 and medial aspect of the lig. trapezoideum is broad above, 

 where it is attached to the coracoid tubercle of the clavicle 

 (Fig. 5, p. 12), and somewhat narrower below at its attach- 

 ment to the medial part of the root of the coracoid process. 

 The ligamentum trapezoideum is the anterior and lateral 

 part. Above, it is attached along the trapezoid line of the 

 clavicle (Fig. 5, p. 12), whilst .below it is fixed to the upper 

 aspect of the coracoid process. In the recess between these 

 two ligaments a bursa mucosa will usually be found. 



Arcus Coracoacromialis (Coraco-acromial Arch). It is 

 necessary to examine this arch at the present stage, as the 

 next step in the dissection will, in a great measure, destroy 

 it. It is the arch which overhangs the shoulder-joint and 

 protects it from above. It is formed by the coracoid process, 

 the acromion, and a ligament the coraco-acromial which 

 stretches between them. 



The ligamentum coracoacromiale is a strong band of a some- 

 what triangular shape. By its base it is attached to the lateral 



