346 



A MANUAL OF ANATOMY 



ligament, inasmuch as it arches over the head of the humerus, and 

 tends to prevent upward displacement of the bone. 



The synovial membrane lines the inner surface of the glenoid 

 ligament, and is reflected from it over the inner surface of the 

 capsule. From this it passes to the anatomical neck of the humerus, 

 which it covers as far as the margin of the articular cartilage 

 of the head. It protrudes through the opening in the front of the 

 capsule to form the subscapular bursa, and it sometimes protrudes 

 through an opening behind to form a bursa beneath the infra- 

 spinatus. The long head of the biceps, in passing from the supra- 

 glenoid tubercle to the bicipital groove, receives a tubular invest- 

 ment from it. This accompanies the tendon for a short distance in 



Capsule of Acromioclavicular Joint Coraco-acromial Ligament 



Trapezoid Ligament 



Conoid Ligament 



Long Head of Biceps 



Glenoid Ligament 



Capsular Ligament 

 (cut) 



Fig. 191. — The Right Glenoid Cavity, and the Adjacent Ligaments. 



the bicipital groove, after which it is reflected upwards to become 

 continuous with the synovial membrane lining the capsule. 



Muscular Relations. — The capsular ligament is closely related 

 to the following muscles : superiorly, the supraspinatus ; pos- 

 teriorly, from above downwards, infraspinatus and teres minor ; 

 inferiorly, long head of the triceps ; and anteriorly, subscapularis. 



Arterial Supply. — ^The suprascapular, and anterior and posterior 

 circumflex, arteries. 



Nerve-supply. — ^The suprascapular and circumflex nerves. 



Movements. — Seven movements are allowed at the shoulder-joint, namely 

 forward flexion, as in shaking hands, extension, backward flexion, abduction, 

 adduction, rotation, and circumduction. 



