350 



THE ARTICULATIONS. 



The Posterior Ligament (Fig. 246) is a thin and loose membranous fold, attached, 

 above, to the lower end of the humerus, on a level with the upper part of the 

 olecranon fossa ; below, to the margin of the olecranon. The superficial or trans- 

 fibres pass between the adjacent margins of the olecranon fossa. The 



verse 



deeper portion consists of vertical fibres, which pass from the upper part of the 

 olecranon fossa to the margin of the olecranon. This ligament is in relation, 



behind, with the tendon of the Tri- 

 ceps and the Anconeus ; in front, 

 with the synovial membrane. 



FIG. 245. Left elbow-joint, showing anterior 

 and internal ligaments. 



FIG. '246. Left elbow-joint, showing 

 posterior and external ligaments. 



The Internal Lateral Ligament (Fig. 245) is a thick triangular band consisting 

 of two portions, an anterior and posterior, united by a thinner intermediate por- 

 tion. The anterior portion, directed obliquely forward, is attached, above, by its 

 apex, to the front part of the internal condyle of the humerus ; and, below, by its 

 broad base, to the inner margin of the coronoid process. The posterior portion, 

 also of triangular form, is attached, above, by its apex, to the lower and back 

 part of the internal condyle ; below, to the inner margin of the olecranon. 

 Between these two bands a few intermediate fibres descend from the internal con- 

 dyle to blend with a transverse band of ligamentous tissue which bridges across 

 the notch between the olecranon and coronoid processes. This ligament is in 

 relation, internally, with the Triceps and Flexor carpi ulnaris muscles and the- 

 ulnar nerve, and gives origin to part of the Flexor sublimis digitorum. 



The External Lateral Ligament (Fig. 246) is a short and narrow fibrous band, 

 less distinct than the internal, attached, above, to a depression below the external 

 condyle of the humerus ; below, to the orbicular ligament, some of its most pos- 

 terior fibres passing over that ligament, to be inserted into the outer margin of the 



