ARTICULATIONS OF THE UPPER EXTREMITIES. 289 



tremities of these bones, and conceals them from view. It is 

 attached to the sides of the os humeri at the lower part of its 

 condyles near the articular surface ; but in front it arises some 

 distance from the articular face at the upper margins of the lit- 

 tle cavities, for the head of the radius and for the coronoid pro- 

 cess of the ulna: behind, it arises in like manner from the upper 

 margin of the cavity for receiving the olecranon process ; so 

 that the depressions, both before and behind, are included with- 

 in the circumference of the articulation. The lower part of 

 the capsular ligament is inserted into the margin of the articu- 

 lar surface of the ulna, all around*, including, also, the whole of 

 the head of the radius, and the upper part of its neck. 



This capsule is strengthened very much at particular points, 

 and as the joint is hinge-like, the strengthening is more abun- 

 dant at its sides, constituting lateral ligarnexits. 



The external Lateral, or the Brachio Radial Ligament, (Lig. 

 Cubiti Externum,) is connected above to the lower part of the 

 external condyle, and is fixed below into the annular ligament 

 which surrounds the neck of the radius. It is very much con- 

 founded with the tendinous mass common to the muscles at this 

 part of the arm, more particularly that of the supinator radii 

 brevis. It is a round fasciculus of parallel and condensed fibres, 

 spreading somewhat below into the annular or orbicular liga- 

 ment. The Internal Lateral or the Brachio Ulnar Ligament, 

 (Lig. Cubiti Iriternum) arises from the lower part of the inter- 

 nal condyle, and spreading out so as to assume a triangular 

 shape, divides into two portions, one of which is inserted into 

 the internal margin of the coronoid pfocess of the ulna, and the 

 other into the internal margin of the olecranon process. It also 

 is much blended with the tendons of the muscles which lie over 

 it. Intermediately to the lateral ligaments, both before and be- 

 hind, the fibrous structure of the capsular ligament is very dis- 

 tinct, but thin, in order to accommodate the motions of the 

 joint; some of the fibres are insula f ed, and have interstices be- 

 tween them filled with fat. Some of these fibres are oblique, 

 and others straight: they are called, generally, accessory liga- 

 ments. 



The Coronary Ligament of the Radius (Lig. Radii Orbiculare) 

 VOL. I. 25 



