152 



ARTICULATIONS OF THE TITEE LIMJ5. 



extends from the centre of the head of the radius to the styloid process of the 

 i;hia. 



Fig. 13S. Fig. 13S.— A, Fkont, and 



b, dack view of the 



Aktic'ULATioxs of the 



Forearm, Wrist anj 

 Hand, i 



1, the internal lateral 

 ligament of the elbow-joint ; 

 2, the external lateral ; H, the 

 anterior ; 4, the posterior ; 

 5, orbicular ligament of the 

 radins ; 6, interosseous niera- 

 brane ; 7, oblique or round 

 ligament ; 8, internal lateral 

 ligament of the wrist ; 9, 

 external ; 10, anterior ; 11, 

 posterior ; 12, palmar, and 

 13, dorsal cariio-metacarijal 

 ligaments ; 14, ligaments 

 connecting metacarpal bones ; 

 15, transverse metacarjjal 

 ligament ; 16, carpo-meta- 

 caqial ligament of the 

 thumb ; 17, lateral liga- 

 ments connecting the phal- 

 angeal with the metacarijal 

 hones ; 18, lateral ligaments 

 of the phalanges. 



THE ELBOW-JOINT, 



The lower extremity 

 of the humerus is in 

 contact Avith the uhia 

 and radius at the 

 elbow, and forms with 

 them a hinge- joint. 

 The greater sigmoid 

 cavity of the ulna arti- 

 culates with the troch- 

 lea of the humerus, so 

 as to admit of flexion 

 and extension only ; while the cup-shaped depression on the head cf 

 the radius is fitted to turn freely on the rounded capitulum. These 

 bones are united ])rincipally by lateral ligaments. 



The internal lateral ligament, composed of diverging and radiat- 

 ing fibres, is divisible into an anterior and a posterior part. The 

 anterior part radiates from the front of the internal condylar eminence 

 of the humerus, and is inserted into the coronoid process, along the 

 inner margin of the sigmoid cavity. The posterior part, of tlie same 

 triangular form, passes from the under and back part of the condylar 

 eminence downwards to the inner border of the olecranon ; and some 

 fibres are connected with a small transverse band, which passes over the 

 notch between the olecranon and the coronoid process. 



The external lateral ligament, intimately connected with the 

 tendinous attachment of the extensor muscles, is shorter and much 



