206 



THE SUPERIOR EXTREMITY 



standing the strain to which this muscle subjects the 

 articulation, certain accessory bands are provided which 

 anchor the pisiform firmly in place they are the piso-hamate 

 and the piso-metacarpal bands. The former passes from the 

 distal end of the pisiform to the hook of the hamate bone ; 

 and the latter attaches the pisiform to the proximal ends of 

 the fourth and fifth metacarpal bones. 



ARTICULATIO INTERCARPEA (INTERCARPAL JOINT). 



The intercarpal joint has one joint cavity, but it includes 

 not only the articulations between the proximal and distal 



Os naviculare 

 manus 



Os capitatum 



Os mult- 

 angulum minus 

 Os multangu- 

 lum majus 



Recessus 

 sacciformis 



FIG. 97. Frontal section through Radio-carpal, Carpal, and Carpo- 

 metacarpal and Inter-metacarpal Joints to show Joint Cavities and 

 Interosseous Ligaments (diagrammatic). 



rows of carpal bones, which form the transverse part of the 

 joint, but also the articulations between the bones of the 

 proximal row and those between the bones of the distal 

 row. The main part of the cavity of the joint lies between 

 the proximal and distal rows; but two prolongations pass 

 proximally, one between the lunate and navicular bones, 

 and the other between the lunate and triquetral bones, and 

 three diverticula are prolonged between the bones of the 



