ARTICULATIONS 1 5 1 



prolonged into the proximal radio-ulnar joint, so that both 

 articulations possess a single continuous synovial cavity. 



Movements at the Elbow-joint. The movements at the elbow -joint 

 must not be confounded with those that take place at the proximal radio- 

 ulnar joint. At the elbow-joint two movements, viz. Jlexion, or forward 

 movement of the forearm, and extension, or backward movement of the 

 forearm, are permitted. 



The imiscles which are chiefly concerned in flexing the forearm upon the 



Humerus 



Anterior 

 ligament ' 



Lig. collaterale 



radiale 



Lig. annulare 



Radius 



Epicondylus 

 medialis 



Lig. collaterale 

 ulnare 



Tendon of biceps brachii 



Chorda obliqua 

 Ulna 



FIG. 60. Anterior aspect of the Elbow-joint. 



arm at the elbow-joint are the biceps, the brachialis, the muscles attached 

 to the medial epicondyle, and the brachio-radialis. The muscles which 

 extend the forearm at this articulation are the triceps and anconaeus and 

 the muscles which spring from the lateral epicondyle. 



Dissection. It is advisable to study the radio -carpal, or wrist -joint, 

 before the articulations between the two bones of the forearm are examined. 

 The transverse volar and dorsal carpal ligaments, together with the 

 extensor and flexor tendons, should be completely removed from the wrist. 

 No attempt, however, should be made to detach the extensor tendons from 

 the dorsal aspects of the fingers and thumb. The short muscles of the 

 thenar and hypothenar eminences must also be taken away. 



