160 



THE SKELETON 



line of articulation between the two rows of the carpus is concavo-convex from side 

 to side, the lateral part of the navicular being received into the concavity formed 

 by the greater multangular, lesser multangular, and capitate, and the capitate 

 and hamate into that formed by the navicular, lunate, and triquetral bones. 



Fig. 189. — Bones of the Left Hand. (Volar surface.) 

 Adductor pollicis obliquus Abductor pollicis brevis 



Flexor carpi ulnaris 



Abductor digiti 



quinti 



Flexor brevis and 



opponens digiti. 



quinti 



Flexor carpi ulnaris 



Adductor pollicis 



transversus 



Opponens digiti 



quinti 



Abductor and 

 flexor brevis 

 digiti quinti 



Opponens and flexor brevis pollicis 

 Occasional insertion into greatei 



multangular 

 Abductor pollicis longus 

 Flexor carpi radialis 



Deep head of flexor pollicis brevis 

 (ist volar interosseus) 

 Opponens pollicis 



Flexor brevis and 

 abductor pollicis 

 —Abductor pollicis and 

 ist volar interosseus 



Flexor pollicis 

 longus 



Flexor digitorum sublimis 



Flexor digitorum profundus 



The individual carpal bones have several points of resemblance. Each bone 

 (excepting the pisiform) has six surfaces, of which the anterior or volar and poste- 

 rior or dorsal arc rough for the attachment of ligaments, the volar surface being 

 the h)roader in the proximal row, the dorsal surface in the distal row. The supe- 

 rior and inferior surfaces are articular, the former being generally convex and the 

 latter concave. The lateral surfaces, when in contact with adjacent bones, are 

 also articular, but otherwise rough for the attachment of ligaments. Further, 

 the whole of the carpus is cartilaginous at birth and each bone is ossified from a 

 single centre. 



The Navicular 



The navicular [os naviculare] or scaphoid (fig. 190) is the largest bone of the 

 proximal row, and so disposed that its long axis runs obliquely downward and 

 lateralward. 



The superior surface i.s (lonvex and somewhat triaiiKuhir in shape for articuhition with the 

 lateral facet on the distal end of the radius. The inferior surface, smooth and convex, is divided 



