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A MANUAL OF ANATOMY 



THE ELBOW-JOINT. 



The elbow-joint belongs to the class diarthrosis and to the 

 subdivision ginglymus. The articular surfaces are the trochlea 

 and capitellum of the humerus above, and the great sigmoid 

 cavity of the ulna and the cup-shaped depression on the head of 

 the radius below. The trochlea articulates with the great sigmoid 

 cavity, and the humeral capitellum with the head of the radius. 

 The joint is surrounded by a capsule, which is made up of four 

 ligaments — ^anterior, posterior, external lateral, and internal lateral. 



Anterior Ligament 



.. Internal Epicondyle 



Orbicular Ligament ^^g 



Tendon of Biceps . 

 (reflected) 



— Brachialis Anticus 

 (reflected) 



.Oblique Ligament 



Fig. 213. — The Right Elbow-Joint (Anterior View). 



The anterior ligament is broad and thin, the central portion 

 "being the strongest. Its fibres are attached superiorly to the front 

 of the humerus above the coronoid and radial fossae, and interiorly to 

 (i) the front of the coronoid process of the ulna, and (2) the orbicular 

 ligament of the radius. Some of its fibres nm vertically and others 

 obliquely, the latter chiefly passing downwards and outwards super- 

 ficial to the former. The ligament is closely covered by the brachialis 

 anticus muscle. 



