ARTHROLOGY. 41 



ANTERIOR LIMB. 



SCAPULO-HUMERAL. 



Enarthrodial joint, between the head of humerus and glenoid 

 cavity of scapula. 

 Ligaments. 



A rudimentary glenoid ligament, deepening the cavity. 



Capsular ligament, from margins of cavity to neck of humerus. 

 Two supporting fasciculi from coracoid process to head of humerus. 



The muscles in relation to joint are 



1. In front, coraco-radial. 



2. Behind, large extensor of forearm and teres minor. 



3. Outside, short abductor of arm and postea spinatus. 



4. Inside, subscapularis. 

 Action. 



Abduction, adduction, flexion, extension, rotation and cir- 

 cumduction. 



HUMERO-RADIAL. 



Ginglymus, between inferior extremity of humerus and upper 

 extremity of ulna and radius. 

 Ligaments. 



Anterior, from humerus above articular surface to anterior part 

 of radius. 



External lateral, from cavity outside of humerus to external 

 portion of radius. 



Internal lateral, inner tuberosity of inferior extremity of humerus, 

 to radial tuberosity and to interosseous fibres. 

 Action. 



Flexion and extension. 



RADIO-ULNAR. 



Two facets and rough surfaces on each bone. 

 Ligaments. 



Two interr osseous, the lower always ossifies, the upper rarely. 



External peripheral band. 



Internal peripheral band. 

 Action. 



Very little in youth, none when consolidated. 

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