43 6 



PRACTICAL ANATOMY. 



found digital flexors ; (4) the flexor longus pollicis ; (5) the extensor communis 

 digitorum ; (6) the special extensor of the little finger ; (7) the special extensor 

 of the index finger; (8) the three extensors of the thumb. Total, 14. 



Explain fully the most important ligament in the radio-carpal articulation. 



The most important is the triangular fibro-cartilage. It may be described as 

 having : (i) A base, attached to the margin of the radius ; (2) an apex, attached 

 to the fossa at base of ulnar styloid ; (3) an anterior border, attached to radio- 



Synovial sac of the inferior radio- 

 ulnar joint 



Synovial sac of the carpus 



Synovial sac, occasionally separate, 

 for the fourth and fifth metacar- 

 pal bones 



Synovial aac of the wrist-joint 



Synovial sac of the carpo- 

 metacarpal joint of the 

 thumb 



Lateral ligaments of the xnetacarpo- 

 phalaugeal. and inter-phalangeal 

 joints 



FIG. 306. SYNOVIAL MEMBRANES OF WRIST, HAND, AND FINGERS. 



carpal and radio-ulnar ligaments ; (4) a posterior border, attached to the radio- 

 carpal and radio-ulnar ligaments ; (5) an upper or ulnar articular surface (con- 

 cave) ; (6) a lower or cuneiform surface (concave). 



How does this cartilage differ from all other fibro-cartilagcs. 



It enters into the formation of two distinct articulations, the inferior radio- 

 ulnar and radio-carpal, separating them completely. 



With hou 1 many bones does the end of the radius articulate / 



With the scaphoid and semilunar. 



