THE UPPER LIMB 



407 



act by keeping the pisiform bone fixed during the action of the flexor 

 carpi ubiaris. 



The pisiform joint has a special synovial membrane. 



Joints of the Second Row. — These belong to the class diar- 

 throsis, and to the subdivision arthrodia. The four bones of the 

 second row are connected by three dorsal, three palmar, and three 

 interosseous ligaments, which are disposed similarly to those of the 



first row. - , , , , 



The s\Tiovial membrane is continuous with that of the transverse 



carpal joint. , . . , ^1. /- ^ 



Transverse Carpal Joint.— This is the joint between the first 



and second rows. It belongs to the class diarthrosis, and partly to 



Interosseous Membrane __/ — 

 Ulna / 



Posterior Radio-ulnar g. — 



Ligament 



Internal Lateral Ligament 



Ligaments between ist.=^ 

 and 2nd Rows 



Ligaments of and Row.-:.- 



Dctacarpal Ligament 



Radius 



Styloid Process of 



Raditis 

 ——---= Posterior Ligament 



Ext. Lateral Ligament 



""^"^^^ Ligaments of ist Row 



Ext. Lateral Ligament 



of ist and znd Rows 



J. V^ _ Carpo-metacarpal 

 " Ligaments 

 Capsule of Carpo- 

 metacarpal Joint 

 umb 



:tacarpal 

 of TnuE 



5.M 



4.M. 5.M. 



IG. 219. — Ligaments of the Radio-c.vrpal, Carpal, Carpo-metacarpai,. 

 AND Intermetacarpal Joints (Posterior View). 



le subdivision arthrodia and partly to the subdivision condyl- 

 throsis. The opposed surfaces of the two rows are each concavo- 

 )nvex, the first in a direction from within outwards, and the second 

 rom without inwards. The convexity of the first row is formed by 

 irt of the scaphoid, and the concavity by part of the scaphoid, 

 Bmilunar, and cimeiform. The concavity of the second row is 

 led by the trapezium and trapezoid, and the convexity by the 

 of the OS magnum and part of the unciform. The two rows 

 connected by dorsal, palmar, and lateral ligaments. The dorsal 

 lents are very indefinite and pass in different directions. The 

 ilmar ligaments for the most part radiate from the os magnum, 



