402 



A MANUAL OF ANATOMY 



below. The carpal surface of the radius, -which presents an outer 

 or scaphoid and an inner or semilunar division, and the triangular 

 fibro- cartilage form a socket, which is concave from side to side 

 and from before backwards. The superior facets of the carpal 

 bones extend more upon the dorsal than palmar aspects, and they 

 present a convexity. The ulna is entirely excluded from this 

 joint by the triangular fibro-cartilage. The joint is surrounded by 

 a capsule, which is made up of four ligaments, namely, anterior, 

 posterior, external, and internal. 



The anterior ligament is a broad, strong membrane, the fibres 

 of which are attached posteriorly to the front of the lower end of the 

 radius, close above the anterior border, and to the anterior margin 



Radius - — /— 



Anterior Ligament - 



External Lateral Ligament - 



Ligaments of ist Row 



External Lateral Ligaments 

 of 1st and 2nd Rows 



Ligaments of 2nd Ro 



Capsule of Carpo- 

 metacarpal Joint 

 of Thumb 



— Interosseous Membrane 

 Ulna 



Anterior Radio-ulnar 



Ligament 



^ Internal Lateral Ligament 

 _ Flexor Carpi Ulnaris 



Pisiform Bone 

 ~~" Ligaments of ist & 2nd Rows 



— Pisi-uiicinate Ligament 



— Pisi-metacarpal Ligament 

 Hook of Unciform 



Intermetacarpal Ligaments 



2.M 



5.M 4.M 



Fig. 217. — The Ligaments of the Radio-carpal, Carpal, Carpo- 

 metacarpal, AND Intermetacarpal Joints (Anterior View). 



of the triangular fibro-cartilage. Interiorly they are attached to 

 the palmar surfaces of the scaphoid, semilunar, and cuneiform bones. 

 The fibres for the most part are directed downwards and inwards. 



The posterior ligament is a broad, weak membrane, the fibres 

 of which are attached superiorly to the posterior border of the 

 radius and triangular fibro-cartilage, and interiorly to the dorsal 

 surfaces of the scaphoid, semilunar, and cuneiform bones, especially 

 the latter. Its fibres are directed downwards and inwards. 



The external lateral ligament is a strong, flattened band, which 

 extends from the tip of the styloid process of the radius to the outer 

 aspects of the scaphoid and trapezium. It supports a portion of the 

 second part of the radial artery. 



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