188 



Joints of the Upper Extremity. 



Ulna__8 



Radius 



Articulatio 

 radioulnaris distalis"" 



Processus styloideus 

 ulnae 



Ligamentum collaterale . 

 carpi ulnare 



Os triquetrum- 

 Os pisiforme_. 



Ligamenta intercarpea ^_ 

 dorsalia 

 Os hainatum 



Ligamenta carpo- 

 rnetacarpea dorsalia ~^M 



Ligaraenta basium 



[ossium rneta- 

 carpalium] dorsalls 



V 



Ligamentum radiocarpeum 

 dorsale 



Ligamentum collaterale 

 carpi radiale 



- Os naviculare 



Os capitatum 



_ Os inultangulum majus 



Articulatio carpo- 

 metacarpea pollicis 



Os multangulum 

 minus 



III 



Ossa metacarpalia 



239. Joints of the right hand, articulatio manus, 



viewed from the back of the hand. 



Articulatio manus (continued) (see also Figs. 238240). On the dorsal surface, the 

 capsule of the articulatio radiocarpea is strengthened by the ligamentum radiocarpeum dorsale 

 (0. T. posterior ligament) which goes from the dorsal margin of the facies articularis carpt'a 

 radii in different divisions to the bones of the first row of the carpus ; the band to the os navi- 

 culare may not be present. 



The articulatio intercarpea possesses on the dorsal surface several short strengthening liga- 

 ments, ligamenta intercarpea dorsalia (0. T. dorsal ligaments), which run usually transversely. 



The articulationes carpometacarpeae (carpometacarpal articulations) are formed on the 

 one side by the distal surfaces of the bones of the second row of the carpus, on the other 

 side by the proximal surfaces of the ossa metacarpalia. Several short perpendicular and oblique 

 ligaments on the volar and dorsal surfaces, ligamenta carpomctacarpea dorsalia et volaria 

 (O.T. dorsal and palmar ligaments) serve to their capsulae articular es as strengthening ligaments ; 

 of the latter, that situated furthest ulnarward extends from the hamulus ossis hamati to the 

 basis ossis metacarpalis V and is called the ligamentum hamatometacarpeum (see Pig. 238). 



The articulationes intermetacarpeae (articulations of the metacarpal bones with one 

 another) have their origin in that the proximal ends of the second to the fifth metacarpal 

 bones can move upon one another by means of their lateral surfaces which are covered with 

 cartilage. Their capsulae articular es are strengthened by short transversely directed fibre 

 bands, ligamenta basium [ossium metacarpalium] dorsalia et volaria of which there are four 

 on the back of the hand, but only three in the hollow of the hand (the ligament between the 

 os metacarpale I and II is absent) (see also Fig. 238). 



