ARTICULA TIONS. LIGAMENTS. 



435 



6. Articular Surfaces. Ulnar of radius, radial surface of ulna. 



7. Basis. A modified capsule, lined by synovial membrane. 



8. Local Parts of Capsule. An anterior radio-ulnar, posterior radio-ulnar, 

 triangular fibro-cartilage. 



9. Strengthening Bands. None ; periosteal purely. 



10. Incorporated Tendons of Obsolete Muscles. None. 



1 1. Blood-supply. Anterior interosseous and anterior carpal. (Fig. 247.) 



1 2. Nerve-supply. Anterior and posterior interosseous. 



13. Ligamentous Muscles. Pronator quadratus and supinator longus. 

 Locate and give the attachments of the anterior radio-ulnar ligament. 



It is attached to the radio-ulnar triangular fibro-cartilage and styloid process. 

 It is located on the anterior part of the bones. 



Locate and give the attachments of the posterior radio-ulnar ligament. 



It is attached to the radius, ulna, and triangular fibro-cartilage anteriorly 

 and posteriorly. 



Posterior radio-carpal 

 ligament 



Capsule of carpo-meta- 

 carpal joint of thumb 



Posterior radio- 

 ulnar ligament 



Internal lateral 

 ligament of wrist 



FIG. 305. POSTERIOR VIEW OF WRIST. 



THE RADIO-CARPAL ARTICULATION. 



1. Class. Diarthrosis, because of free motion and a capsule. 



2. Subdivision. Condylarthrosis, because rotation on a vertical axis is 

 wanting ; /. t\, there is no axial rotation. 



3. Teclinical Name. Radio-carpal articulation. 



4. Osteological Units. Radius, scaphoid, semilunar, cuneiform, cartilage. 



5. Subdivisional Parts of Units. None. 



6. Articular Surfaces. According to the general rule. 



7. Basis. A modified and highly specialized capsule. 



8. Local Parts of Capsule. Anterior, posterior, internal, external. 



9. Strengthening Bands. None ; purely periosteal. 



10. Incorporated Tendons of Obsolete Muscles. None. 



11. Bony Limitations. Radial and ulnar styloids. 



1 2. Blood-supply. Anterior and posterior carpal arterial arches. 



13. Ligamentous Muscles. (i)The flexors of the carpus, on radius and ulna ; 

 (2) the extensors of the carpus, on radius and ulna ; (3) the sublime and pro- 



