SCArULO-CLAVICULAR APvTICULATIOX. 



147 



The acromio-clavicular articulation is a synovial joint uniting 

 the outer extremity of the clavicle 'with the inner edc^e of the acromion. 

 It is supported above by a thick and broad superior lirjament, and 

 below by an inferior liijament which is not so strong. An infrrarfiniJar 

 Jihro-carfiJage is frequently present, but is sometimes wanting. It is 

 wedge-shaped, attached by its base to the superior ligament, and 

 only partially separates the small oval articular surfaces. 



Fi.?. 133. 



Fig. 133.- 



-VlEW FROM BEFORE OP THE ARTICULATIONS OP THE ShOCLDER BoNES. 



(A. T.) i 



1, aci-omio-cla%-icular articulation ; 2, conoid, and 3, trapezoid part of the coraco- 

 clavicular ligament ; 4, near the suprascapular ligament ; 5, on the coracoid process, 

 points to the coraco-acromial ligament ; 6, the capsular ligament of the shoulder joint ; 

 7, the coraco-humeral ligament ; above 6, an aperture in the capsular ligament through 

 which the tendon of the subscapularis muscle passes ; 8, tendon of the glenoid head of 

 the biceps muscle ; 9, right half of the interclavicular ligament ; 10, interai-ticular fibro- 

 cartilage of the stemo-clavicular articulation ; 11, the costo-clavicular ligament ; 12 and 

 13, the cartilage and small imrt of the second and third ribs attached by their anterior 

 costo-sternal lisaments. 



The coraco-clavicular ligament, which connects the clavicle 

 with the coracoid process of the scapula, is divisible into two parts. 

 The conoid ligament, which is the posterior or internal fasciculus, broad 

 above, narrow below, is attached inferiorly to the inner parfe of the root 

 of the coracoid process, and superiorly to the conoid tubercle of the 

 clavicle : its fibres are directed backwards and upwards. The trapezoul 

 ligament, the anterior or external fasciculus, slopes upwards, backwards, 

 and outwards from the inner border of the coracoid process to anob- 

 lioue line extending outwards from the conoid tubercle, on which it i& 



L 2 



