LIGAMENTS OF THE SCAPULA. 



137 



partial connections with the fibre-cartilaginous surfaces of the two 

 bones between which it is placed, and not unfrequently absent. 

 When partial, it occupies the upper part of the articulation. The 

 synovial membranes are very delicate. There is, of course, but one, 

 when the fibro- cartilage is incomplete. 



Fig. 64.* 



Actions. The acromio-clavicular articulation admits of two move- 

 ments, the gliding of the surfaces upon each other ; and the rotation of 

 the scapula, upon the extremity of the clavicle. 



3. The Proper ligaments of the Scapula are the 

 Coraco-acromial, 

 Transverse. 



The coraco-acromial ligament is a broad and thick triangular band, 

 which forms a protecting arch over the shoulder joint. It is attached 

 by its apex to the point of the acromion process, and by its base to the 

 external border of the coracoid process its whole length. This ligament 

 is in relation above with the under surface of the deltoid muscle ; and 

 below with the tendon of the supra-spinatus muscle, a bursa mucosa 

 being usually interposed. 



* The ligaments of the scapula and shoulder joint. 1. The superior acro- 

 mio-clavicular ligament. 2. The coraco-clavicular ligament ; this aspect of 

 the ligament is named trapezoid. 3. The coraco-acromial ligament. 4. The 

 transverse ligament. 5. The capsular ligament. 6. The coraco-humeral 

 ligament. 7- The long tendon of the biceps issuing from the capsular liga- 

 ment, and entering the bicipital groove. 



