290 



ARTICULATIONS. 



non depression ; below, to the margin of the olecranon. The superficial or 

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

 The 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 rela- 

 tion, behind, with the tendon of the Triceps and the Anconeus; in front, with 

 the synovial membrane. 



Fig. 199. Left Elbow-joint, showing Anterior 

 and Internal Ligaments. 



Fig. 200. Left Elbow-joint, showing Posterior 

 and External Ligaments. 



The Internal Lateral Ligament (Fig. 199) is a thick triangular band, consisting 

 of two distinct portions, an anterior and posterior. The anterior portion, di- 

 rected obliquely forwards, 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. This ligament is in 

 relation, internally, with the Triceps and Flexor Carpi Ulnaris muscles, and 

 the ulnar nerve. 



The External Lateral Ligament (Fig. 200) is a short and narrow fibrous fasci- 

 culus, less distinct than the internal, attached, above, to the external condyle 

 of the humerus ; below, to the orbicular ligament, some of its most posterior 

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

 ulna. This ligament is intimately blended with the tendon of origin of the 

 Supinator Brevis muscle. 



The Synovial Membrane is very extensive. It covers the margin of the arti- 

 cular surface of the humerus, and lines the coronoid and olecranon depressions 



