Joints of the Upper Extremity. 



189 



Ulna 



Recessus sacciformis 



articulationis radio 



ulnaris distalis 



Discus articularis- 



Processus 

 styloideus ulnae " 



Os triquetrum 



Articulatio 

 ossis pisiformis ~ 

 Os pisiforme- 



Os capitatum 



Ligamentum inter- 



carpeum interosseum 

 Os hamatum-- 



Ligamentum basium 



[oss. metacarp.] 



interosseum 



Articulatio inter- 



metacarpea 



Radius 



Articulatio radiocarpea 

 Os lunatum 

 Os naviculare 



_ Articulatio intercarpea 



Os multangulum minus 

 Os multangulum majus 



Articulatio carpo- 

 l~ metacarpea pollicis 

 . Articulatio carpometa- 

 carpea 



24O. Joints of the right hand, articulatio manus, 



from the back of the hand. 



(The surface of a frozen hand has been filed off until the joint cavities have been opened.) 



Articulatio maims (continued). The joint cavity of the articulatio radiocarpea 

 is connected neither with that of the articulatio radioulnaris distalis nor with that of the 

 articulatio intercarpea. 



The slits between the individual joint surfaces of the bones which together form the 

 articulatio intercarpea are usually all connected not only w r ith one another, but also with 

 the joint cavities of the articulationes carpometacarpeae and intermetacarpeae of the second 

 and third fingers. Short, strong licj amenta intercarpea inter os sea extend in the depth in a 

 transverse direction between the neighboring wrist bones of the same row. 



The joint cavity of the articulatio ossis pisiformis is usually separated from the others. 



In the articulationes carpometacarpeae of the second and third finger the joint slits 

 are usually connected with those of the articulatio intercarpea, and with those of the articu- 

 lationes intermetacarpeae between the first, second, third and fourth finger; the articu- 

 lationes carpometacarpeae and the articulatio inter metacarpea of the fourth and fifth fingers 

 are usually separated from the others, the articulatio carpometacarpea pollicis always. 



The three articulationes intermetacarpeae possess, iu the depth, short, transverse 

 ligamenta basinm [ossium metacarpalium] intcrossea. The joint capsules go off from the 

 margins of the surfaces covered with cartilage. 



