ELBOW-JOINT 



321 



IV. Elbow-joint (Articulatio Cubiti) (Figs. 329, 330). 



The elbow-joint is a ginglymus or hinge-joint. The trochlea of the humerus is 

 received into the semilunar notch of the ulna, and the capitulum of the humerus 

 articulates with the fovea on the head of the radius. The articular surfaces are 

 connected together by a capsule, which is thickened medially and laterally, and, 

 to a less extent, in front and behind. These thickened portions are usually described 

 as distinct ligaments under the following names: 



The Anterior. The Ulnar Collateral. 



The Posterior. The Radial Collateral. 



Fia. 329. Left elbow-Joint, showing anterior and 

 ulnar collateral ligaments. 



Fio. 330. Left elbow-joint, showing posterior and 

 radial collateral ligaments. 



The Anterior Ligament (Fig. 329). The anterior ligament is a broad and thin 

 fibrous layer covering the anterior surface of the joint. It is attached to the front 

 of the medial epicondyle and to the front of the humerus immediately above the 

 coronoid and radial fossse; below, to the anterior surface of the coronoid process 

 of the ulna and to the annular ligament (page 324), being continuous on either 

 side with the collateral ligaments. Its superficial fibers pass obliquely from the 

 medial epicondyle of the humerus to the annular ligament. The middle fibers, 

 vertical in direction, pass from the upper part of the coronoid depression and 

 become partly blended with the preceding, but are inserted mainly into the anterior 

 surface of the coronoid process. The deep or transverse set intersects these at 

 right angles. This ligament is in relation, in front, with the Brachialis, except 

 at its most lateral part. 

 21 



