mi BO 'i in; 



The greater multangular articul ath the fir 



shaped .surface; the lesser multangular (trapi turn 



iini) with the third, and the hamatum (unciform) with the 

 bom - Figs. 1 26 and 1 27 . 



In addition to these, the following l< rticular I 



the lunatum (scmilui ipitatum 



the lunatum (semilui ne, for tl it;itum ( 



the triquetral (cun< the lunatum 



multangulai ivicular and ultangu: 



for I d Ix.tu-; on the lesser multangulai 



rion of the surfai e of ti. 



and the navicular !>• the capitatum (,<>s n 



the second, the third, an<l the fourth metacarpal 

 trum, and 1 ■.. ne. 



All of tl at birtl 



itum the center during the I ir, in thi 



in the pisiform nut until the twelfth year <>r even lal 



Supernumerary tar; 



■ which i 

 the b I. In the adult it is usually I 



THE METACARPAL BONES. 



The five metacarpal bom Fig. [26 to 1 ;i are typical long bones in which r 

 nized a proximal extremit) .md a distal extremity 



with the distal row of carpal . the hi . ith the pr 



metacarpal bone <>t" the thumb is the shortest, that of the index 

 ually decrease in length toward the little fingi 



Tlu- bases <>!" the metacarpal bones are irregularly cubical and thick :iat 



of the metacarpal bone ^i the thumb beat iddle shap 



trapezium, and the remaining ones present, in addition t. 

 bones, lateral surfaces for articulation with each other. The I the thi 



~cnt- .1 styloid pi I [28 which is directed I 



Thi 

 one I ■ r multangular (trap 



ulnar one i<>r tin tin- third mi 



for thr capitatum 

 metacarpal bone; tin tin- fourth i: 



r the third, .-pal 



'• proximal facet for tin- I 

 oi the nutn . nutrient canal which pu 



forearm. 



The shaft of each metacarpal hone, with th< : that of the thumb, is approxi- 



mately three-sided, and pos - a palmar and a dorsal border. The palmar border becor 

 flat as it passes toward the base, while the dorsal b out into a surface as it 



approaches the head. 



