THE ELBOW-JOIXT. 



153 



Fig. 139. — Ligaments op the Elbow- Joint. (A. T.) i 



A, from the outer side and beliiml ; 1>, from tlie front ; C, from the inner side and 

 behind. 1, internal lateral ligament ; 2, external lateral ; 3, the middle strongest part 

 of the anterior ligament ; 4, orbicular ligament ; 5, posterior, represented as wrinkled 

 from relaxation in extension. In these figures the round ligament and upper part of the 

 interosseous membrane are also represented below the elbow -joint. 



narrower than the internal. It is attached superiorly to the external 



condylar eminence of the hnmerns, and inferiorly 



becomes blended with the annular ligament of the Fig- UO- 



radius, some of its hinder fibres being prolonged 



to the external margin of the ulna. 



Fig. 140. — Vertical Antero-Posterior Section op the 

 Elbow-Joint through the Greater Sigmoid Cavity 

 OP THE Ulna and corresponding Trochlear surface 

 OF THE Humerus. (A. T.) i 



1, cut surface of the humerus ; 2, that of the ulna ; 3, 

 jjosterior jjart, and 4, anterior part of the synovial cavity of 

 the joint ; 5, orbicular ligament enclosing the head of the 

 radius ; 6, tendon of the biceps muscle at its insertion into 

 the tuberosity ; 7, is at the lower end of the round ligament. 



The anterior ligament consists of a thin sheet 

 of fibres, strongest in its middle part, extending 

 downwards from above the coronoid pit of the 

 humerus to the coronoid process of the ulna and 

 the orbicular ligament. 



The posterior ligament is comparatively 

 thin and weak, and consists of loose and irregular 

 fibres passing tranversely across the olecranon 

 fossa of the humerus, and from the sides of that fossa to the 



