ELBOW JOINT 



307 



The orbicular ligament of the upper radio-ulnar articulation must also be 

 reckoned among the ligaments of the elbow (see p. 310). 



The anterior ligament (Fig. 248) is a broad and thin fibrous layer which covers 

 the anterior surface of the joint. It is attached, above, to the front of the internal 

 condyle and to the front of the humerus immediately above the coronoid and 

 radial fossae; below, to the anterior surface of the coronoid process of the ulna 

 and to the orbicular ligament, being continuous on each side with the lateral 

 ligaments. Its superficial fibres pass obliquely from the inner condyle of the 

 humerus outward to the orbicular ligament. The middle fibres, vertical in 

 direction, pass from the upper part of the coronoid depression and become partly 

 blended with the preceding, but are mainly inserted into the anterior surface of 

 the coronoid process. The 

 deep or transverse set inter- 

 sects these at right angles. 

 This ligament is in relation, 

 in front, with the Brachialis 

 anticus muscle, except at its 

 outermost part. 



The posterior Ggament 

 (Fig. 249) is a thin and loose 

 membranous fold, attached, 

 above, to the lower end of 

 the humerus, above and at 

 the sides of the olecranon 

 fossa; below, to the groove 

 on the upper and outer sur- 

 faces of the olecranon. The 

 superficial or transverse fibres 

 pass between the adjacent 

 margins of the olecranon 

 fossa. The deeper portion 

 consists of vertical fibres, 



CORONOID 

 FOSSA 



OLECRANON 

 FOSSA 



ARTICULAR 

 CAPSULE 



CPIPHYSEAL 

 JUNCTION 



of which, thin and 

 pass from the upper 



EPIPHYSEAL 

 JUNCTION 



some 

 weak, 



part of the olecranon fossa to 

 the margin of the olecranon; 

 others, thicker and stronger, 

 pass from the back of the 

 capitellum of the humerus to 

 the posterior border of the 

 lesser sigmoid cavity of the 

 ulna. This ligament is in 

 relation, behind, with the 



tendon of the Triceps muscle FIG. 250. Right elbow-joint, cut through at right angles to the 



and the Anconeus muscle. s trochlea humeri ' from the ulnar side ' (Spalteholz - ) 



The internal lateral ligament (ligamentum collateral ulnare) (Fig. 248) is 

 a thick triangular band consisting of two portions, an anterior and posterior, 

 united by a thinner intermediate portion. 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 condyle to blend with a transverse band of ligamentous 



